Aftermarket vs Genuine Side Mirrors: Which Do You Need?
By Duber, The Car Mirror Man · Car Mirrors Australia · Updated August 2026 · 13 min read
Short answer: it depends entirely on which part. Plain mirror glass from a quality aftermarket supplier is genuinely equivalent, and correct curvature matters far more than the badge. Driver-assist glass, blind-spot modules and unusual colour-matched covers are where genuine earns its price. A specialist should tell you which of those you are in before ordering anything.
In Melbourne? We can tell you which part your car actually takes at your home or work, anywhere across the metro — see our full Melbourne mirror service.
This is the second question almost every customer asks, and it usually gets a lazy answer in both directions. Some workshops say genuine always, which is safe and expensive. Some say aftermarket always, which is cheap and occasionally wrong. Neither is a diagnosis. A side mirror is four separate parts, and the honest answer changes for each one.
What “genuine” actually means
Worth defining, because the word is used loosely and the difference between the three categories is real.
Most of the argument people have is really between the second and fourth of those, which are wildly different things sharing one word.
Mirror glass: aftermarket is genuinely fine
The part that breaks most often is also the part where the distinction matters least.
A piece of mirror glass has three properties that matter: the curvature, the size and shape of the backing plate, and whether the heating element and its connector match. Get those three right and there is no functional difference between a quality aftermarket panel and a genuine one.
What there is not, on plain glass, is any electronics, coding, calibration or paint. Nothing is model-locked in software. That is why the price gap between genuine and aftermarket glass is so much larger than the actual difference in the part.
Curvature is the thing that actually matters
If you take one technical point from this article, take this one.
Side mirror glass is not flat. Passenger-side glass in Australia is convex, which widens the field of view and shrinks apparent distance — the reason for the warning printed on it [5]. Driver-side glass is flat or very mildly curved on most vehicles.
The curvature is specified per model. Fit a panel with the wrong radius and it will physically fit the housing, look correct in the driveway, and distort distance on the freeway in a way you notice at 100km/h and not before.
Heated glass: check the connector, not the badge
A step up in complexity, and still usually an aftermarket-is-fine answer.
Resistance and coverage. A mismatched element either does not clear the glass or draws wrong.
Spade type, spacing and polarity. This is where cheap parts fail.
A heated mirror fitted with the element left unplugged is a job half done. It is common.
Switch on, wait, feel the glass. Thirty seconds, and it is the step that separates finished from nearly finished.
Any quote for heated glass should include reconnecting and testing the element. If it does not say so, ask, because the omission is not always accidental.
Covers: where the paint code decides it
The cover is the one part where the answer flips depending on your car's colour.
| Cover type | Recommendation | Why |
|---|---|---|
| Black textured | Aftermarket | No paint match. Common on utes and base models. Genuinely identical |
| Common solid colour | Either | White, silver, common greys. Aftermarket painted to code is reliable |
| Metallic or pearl | Genuine, usually | Multi-stage finishes are hard to match, and a near-miss is obvious in sunlight |
| Chrome or satin | Genuine | Plating quality is where cheap parts show immediately |
| With an integrated repeater | Match carefully | The indicator strip and its seal have to be right or water gets in |
A mirror cover sits at eye height in direct sun on a car's most-looked-at surface. It is the one place where a colour that is nearly right is worse than not replacing it at all.
Where the paint code lives on your car
Since half the cover conversation depends on it, worth knowing where to find it.
On most vehicles the paint code is on a compliance or build plate, usually in the driver's door jamb, sometimes under the bonnet or in the boot. It is a short alphanumeric code, often labelled colour, paint or C/TR.
Photograph that plate and send it with your mirror photo. It removes the single most common source of a wrong part, and it takes ten seconds.
If the original cover came off in one piece, keep it. On some vehicles the part number is moulded into the back of it, which is the fastest confirmation there is.
Driver-assist mirrors: this is where genuine matters
Blind-spot monitoring, cameras and auto-dimming change the answer completely, and it is worth understanding why rather than taking it on faith.
A blind-spot mirror is not a mirror with a light in it. The indicator is driven by a sensor system that has to agree with the car about what it is seeing [4], and the module behind the glass is specific to the model and often to the build year within that model.
Fit a near-match and you get one of three outcomes: it does not illuminate, it illuminates incorrectly, or the car logs a fault. None of those are acceptable on a safety system, and none are worth the saving.
Auto-dimming and camera glass
Two more cases in the same category, for the same reason.
The common thread: once a mirror is talking to the car rather than just reflecting, the correct part becomes a functional requirement rather than a preference.
How to tell what your mirror has
Thirty seconds standing at the door, and it decides the whole conversation.
An amber triangle or a small light means blind-spot monitoring.
A small lens pointing down is a kerb or surround-view camera.
A light shining onto the ground when you unlock is a puddle lamp.
Positions marked L and R with a memory button means position memory.
If it clears itself, it is heated.
Tell us what you found, and we will tell you honestly which category each part of the job falls into before anything is ordered.
What a wrong part actually costs
The saving on a cheap part is real. So is the failure mode, and it is usually larger.
| Failure | What it costs you |
|---|---|
| Wrong curvature glass | Distorted judgement of distance at speed. Replaced again, properly |
| Mismatched heating connector | Element left disconnected, or drawing incorrectly. Refit |
| Near-miss painted cover | Visibly wrong in sunlight on the most-looked-at panel. Replaced again |
| Wrong blind-spot module | System inactive or misreporting. Dash fault. Replaced with the correct part |
| Poor-fit housing | Wind noise at freeway speed, and water into the assembly |
In every row the outcome is the same: the part gets replaced a second time, and the total is higher than doing it once. That is the actual argument, and it has nothing to do with brand loyalty.
What we do, and why
Stated plainly, because a policy is more useful than a slogan.
The reason we can be specific is that mirrors are the only thing we do. A workshop fitting three mirrors a month sensibly defaults to genuine everything. Fitting hundreds a week is what makes the distinction worth drawing.
Warranty, and your rights either way
This part is often assumed and rarely checked.
Consumer guarantees under Australian Consumer Law apply to the part and to the workmanship regardless of whether the part was genuine or aftermarket [2]. A part that fails prematurely, or work that was not carried out with due care and skill, is covered.
Separately, fitting a quality aftermarket part does not void a vehicle's warranty in the way people fear. What matters is whether the part caused the failure being claimed — which is exactly why the driver-assist distinction above is worth taking seriously and the plain-glass one is not.
We give a three-year written warranty on a full unit and a written warranty on individual parts. Ask any quote for the same in writing.
Questions worth asking any quote
Five, and the answers tell you more than the price does.
All three are legitimate answers. No answer is not.
Curvature is the whole question on plain glass.
If the car has heated mirrors.
The two most common places for a quote to grow.
Length, and what it covers.
A supplier who answers all five specifically is quoting a job. One who answers in generalities is quoting a category.
Why the price gap is so much wider than the quality gap
The genuine premium on a mirror part is not primarily a materials story, and understanding why makes the decision easier.
None of that means the genuine part is worse value in the cases where it matters. It means the gap you are looking at is mostly structural, which is why it is so large on plain glass and so much more reasonable on a driver-assist module.
Buying the part yourself: the four ways it goes wrong
A lot of people try this, and we see the results. Worth knowing the failure modes before you spend.
Left and right glass are different curvatures, not mirror images of one another. It is the most common error.
Build-year and trim changes within one model line are frequent and not obvious in a listing.
The glass fits, the element does not plug in, and the mirror is now unheated.
If the part is wrong, the labour was still spent, and nobody carries the cost but you.
This is why we supply and fit rather than fitting customer-supplied parts. It is not a margin position — it is that we cannot warrant a job where we did not choose the part.
A worked comparison on one common car
A Mazda 3 with cracked driver's-side glass, plain mirror, no blind-spot.
| Route | Part supplied | Outcome |
|---|---|---|
| Dealer, complete assembly | Genuine, all four layers | Correct, and several times the cost of the failure |
| Us, aftermarket glass cut to model | Quality aftermarket panel | Correct curvature, fitted at your work, from $135 |
| Online generic panel, self-fitted | Unknown curvature | Fits the housing, distorts distance at freeway speed |
All three end with a mirror in the housing. Only two of them end with a mirror you can judge a lane change from, and only one of them is proportionate to what actually broke.
What Melbourne drivers tell us
Getting the right part first time is most of what a specialist is for.
Every review quoted on this site is a real, verified customer review. We do not write them and we do not edit them.
The short version
If you remember nothing else.
And the thing that decides all three: someone actually looking at your mirror before ordering a part for it. Send a photo and we will tell you which of the three you are in, and what each one costs.
Every band above comes from our national price guide, which is the single source of truth for what we charge. If you want the full breakdown by part and by vehicle, read our side mirror replacement cost guide.
Frequently asked questions
Are aftermarket side mirrors any good?
Quality aftermarket glass and covers are genuinely equivalent to genuine parts, provided the curvature, the backing plate and any heating connector match your model. Cheap generic parts are a different category and are where the problems come from.
Will an aftermarket mirror void my car's warranty?
No. Consumer guarantees apply to the part and the work regardless [2], and a warranty claim turns on whether the part caused the failure, not on whether it carried a badge.
When should I insist on a genuine part?
Blind-spot, camera and auto-dimming mirrors, and unusual metallic or chrome covers. Everywhere else, quality aftermarket is a reasonable choice.
What is the difference between OEM and genuine?
Genuine comes in the manufacturer's box through the dealer network. OEM is often the identical part from the same factory without the badge, at a lower price.
Why does mirror curvature matter so much?
Convex glass widens the field of view and makes objects appear further away than they are [5]. The radius is specified per model, and the wrong one distorts your judgement of distance at speed.
Can you tell which parts my mirror has before quoting?
Yes, from a photo of the mirror and the build plate. That is exactly what we ask for, and it is why our quotes are fixed rather than ranges.
Do you fit customer-supplied parts?
We generally do not, because the most common problem we see is a part bought online that is the wrong curvature, side or connector. We would rather supply and warrant the whole job.
How much does aftermarket save?
On plain glass, a great deal — fitted glass starts from $135 where an assembly quote is often several times that. On driver-assist parts the saving is not worth taking.
More on Melbourne mirrors
Based in Melbourne? These cover the rest of it.
Sources
- Consumer guarantees on goods and services, ACCC — www.accc.gov.au/consumers/buying-products-and-services/consumer-guarante
- Australian Design Rule 14/02 — Rear Vision Mirrors, Federal Register of Legislation — www.legislation.gov.au/Details/F2006L02663
- Blind spot monitor — how the sensors and indicators work, Wikipedia — en.wikipedia.org/wiki/Blind_spot_monitor
- Wing mirror — history, design and regulation, Wikipedia — en.wikipedia.org/wiki/Wing_mirror
- ADR 14/02 Rear Vision Mirrors, full technical text (PDF), Department of Infrastructure — www.infrastructure.gov.au/sites/default/files/migrated/vehicles/design/f
- Maintenance and repairs — your rights, Consumer Affairs Victoria — www.consumer.vic.gov.au/consumers-and-businesses/cars/maintenance-and-re
- Car insurance — excess, cover types and claims, Moneysmart (ASIC) — moneysmart.gov.au/car-insurance
- Defogger — heated mirror and rear-window elements, Wikipedia — en.wikipedia.org/wiki/Defogger
Prices and information in this article are indicative only and reflect real quoted jobs at the time of publication. Costs vary with vehicle, part availability and features. Send a photo for an exact fixed price.
