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Fitment on a used rear view mirror varies by vehicle, so a bit of detail goes a long way. Our request form covers what breakers need to know, so every quote you get back is for the correct part:
The GLS X166 generation ran from 2016 to 2019, while the current X167 generation launched in 2020, so these are different generations with different interior designs and mirror fixings. A mirror from a 2016–2019 X166 is very unlikely to be compatible with a 2020-onwards X167. Confirm with the breaker against your registration before ordering.
Yes, generation matters most here — the X166 (2016–2019) and the X167 (2020-onwards) are distinct platforms with different interior fittings and mirror mounting arrangements. Within the same generation, mirrors are generally interchangeable, but confirm the exact year with the breaker against your registration to be sure.
For the rear view mirror itself, trim level is less likely to be a direct fitment barrier than generation, but higher trims such as AMG Line may include auto-dimming or camera-integrated mirrors that differ from those on base-spec models. When sourcing a used mirror, check whether your car has these features and make sure the replacement matches — your breaker can confirm against your registration.
It can do — some GLS models are fitted with rain sensors, auto-dimming, or a built-in camera as part of driver-assistance packages, and these functions are built into the mirror itself. A plain mirror from a lower-spec car may not include these features, so it is worth telling the breaker exactly which functions your current mirror has so they can match it correctly.
Engine variant does not affect the rear view mirror — this is an interior fitment that is matched by generation and specification, not by what is under the bonnet. Focus on getting the generation (X166 or X167) and any integrated features right, and the engine code can be disregarded entirely.
Give the breaker your full registration number so they can check the part against your specific car — this matters because mirrors vary by generation and by whether your car has auto-dimming, a camera, or rain-sensor integration. Visually compare the mounting point and connector type with your existing mirror if possible. Never assume fitment based on generation alone without checking the spec details with the breaker.