Used Mercedes-Benz GLS Front Cross Member

The GLS has run in two generations in the UK: the first-generation X166, produced from 2016 to 2019, and the second-generation X167, which launched in 2020 and remains current. The X166 was itself a renamed and lightly revised version of the GL-Class that preceded it from 2012, so if you have a 2016–2019 plate it is X166 GLS, and 2020 onwards is X167. Always confirm your exact generation with your registration when speaking to a breaker.

A 2017 GLS is an X166 and a 2021 GLS is an X167 — these are different generations with different platform dimensions and suspension geometry, so the front cross member is very unlikely to interchange. You should source an X167 cross member for your 2021 car and confirm this against your registration with the breaker before purchasing.

Yes, it can — larger-engined variants such as the GLS 580 or AMG GLS 63 may use a heavier-duty front subframe to cope with greater powertrain weight and braking demands compared to the GLS 400 d or GLS 450. Always tell the breaker your exact engine designation so they can match the correct cross member, and confirm fitment against your registration.

Trim levels like AMG Line, AMG Line Premium, or base specification do not change the front cross member itself, as this is a structural running-gear component unaffected by cosmetic or interior grade differences. You may find that AMG Line cars carry minor exterior styling differences, but these do not alter the subframe, so a cross member from a same-generation, same-engine GLS in a different trim should suit your car. Confirm the generation and engine match with the breaker against your registration before buying.

The X166 GLS did not receive a significant structural mid-generation refresh in the way some models do, but minor running-gear revisions can occur during a production run, meaning a part from early in the generation may differ from a later one. Because we cannot state with certainty whether a specific subframe crossed any mid-run change, you should confirm the exact production date and part number with the breaker against your registration rather than assuming year-for-year compatibility.

Give the breaker your full registration number, which lets them pull the exact VIN and confirm generation (X166 or X167), engine code, and any powertrain-specific subframe variants. Also let them know whether the car is a standard GLS or an AMG GLS 63, as the AMG model may use a different cross member due to its higher-output engine and uprated running gear. The more detail you provide upfront, the less risk there is of receiving an incompatible part.