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Fitment on a used door lock mechanism 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 Mercedes-Benz GLS spans two distinct generations: the first generation (X166) ran from 2016 to 2019, and the second generation (X167) launched in 2019 onwards — these are different platforms with different door architecture, so a lock mechanism from the X166 will not fit an X167. Always match the part to the correct generation, and confirm the exact build date of both donor and recipient vehicles with the breaker against your registration, as production changeovers do not always align neatly with calendar years.
Yes, door lock mechanisms are side-specific — the nearside (NS, passenger/left) and offside (OS, driver/right) units are handed and will not swap between sides. When contacting a breaker, be clear whether you need NS or OS, and confirm which door (front or rear) is affected, as front and rear mechanisms are also different parts.
Trim level does not affect door lock mechanism fitment on the GLS — the mechanical locking hardware is the same across trim grades such as standard, AMG Line, and AMG versions within the same generation. You may find cosmetic differences on surrounding interior trim panels, but the lock mechanism itself is interchangeable across trims within the same generation and door position.
A 2017 GLS is a first-generation model, known as the X166, which was produced from 2016 to 2019. When contacting a breaker, tell them you have an X166 GLS, specify whether you need the nearside or offside mechanism, and confirm front or rear door — they will cross-reference your registration to pinpoint the exact specification.
No — the engine and drivetrain make no difference to door lock mechanism fitment on the GLS, since it is a body-side component entirely unrelated to what is under the bonnet. Whether your car is a diesel, a petrol, or an AMG 63 variant, the correct mechanism is determined solely by generation (X166 or X167), the door position, and the side (NS or OS).
2018 is X166 (first generation) and 2019 marks the introduction of the X167 (second generation), so these are different platforms and the parts are not expected to be interchangeable. However, exact changeover timing at the production boundary can vary, so confirm the specific build dates and part numbers of both vehicles with the breaker against each registration before purchasing.