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Fitment on a used boot lid 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 has two clear generations: the first-generation X166, produced from 2016 to 2019, and the second-generation X167, which launched in 2020 and is still current. Boot lids are generation-specific, so a lid from any X166 (2016–2019) will not fit an X167 (2020-on) and vice versa. Always confirm the generation against your registration with the breaker before buying.
Both the 2017 and 2019 GLS are X166-generation vehicles, so they share the same platform and body shell. A boot lid from either year should be compatible, as engine choice and trim level make no difference to the pressing. That said, confirm with the breaker against your registration in case of any mid-run pressing changes Mercedes may have introduced.
No — 2019 is the final year of the first-generation X166, while 2020 onwards is the all-new second-generation X167 with a completely different body shell. These two generations do not share boot lid pressings, so this is a firm generation boundary you cannot cross. Stick to sourcing from a breaker with an X167 donor vehicle for a 2020-on GLS.
Trim level does not affect the boot lid pressing itself — the same panel fits across standard, AMG Line, and other GLS trim grades within the same generation. You may find cosmetic differences such as trim badges, spoilers, or finisher strips that vary between grades, so check with the breaker whether these items are included or need to be swapped over. The structural panel itself remains interchangeable across trims.
The GLS replaced the GL-Class (X166 platform) from 2016, but the earlier GL-Class X166 ran from 2012 to 2015 under the GL name before the GLS rebadge. Whether parts from a GL-Class X166 donor interchange directly with a GLS X166 is something you should confirm with the breaker against both registrations, as panel or pressing differences between same-platform variants sold under different names cannot be stated as fact here.
The Mercedes-Benz GLS is offered exclusively as a large five-door SUV, so there is no body-style variation to worry about when sourcing a boot lid for this model. Generation is the only structural factor that matters — just ensure the donor vehicle matches your X166 or X167 build year. Engine size and specification make no difference whatsoever to the fitment of the boot lid.