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The GLS nameplate launched in 2016 when Mercedes renamed the GL-Class, covering the first GLS generation (X166, 2016–2019) and the second generation (X167, 2019–present). The bulkhead is a generation-specific pressing, so an X166 unit will not cross over to an X167 and vice versa. Always confirm the generation code with your breaker against your registration before ordering.
A 2017 GLS sits in the X166 generation (2016–2019), while a 2020 GLS is an X167, so you are crossing a generation boundary and the bulkheads are not the same pressing. You should treat these as two entirely different vehicles when sourcing this part. Confirm with your breaker against both registrations before proceeding.
Trim level does not affect bulkhead fitment on the GLS — the structural pressing is the same whether the car is a standard GLS 400d, an AMG Line or an AMG 63. The only differences you might notice are how ancillary brackets or sound-deadening materials are finished, which are cosmetic rather than structural. Stick to matching generation and body style and you will be fine.
The GL-Class X166 (2013–2016) and the GLS X166 (2016–2019) share the same platform and the GLS was essentially a rename of the GL at that point, so there is a genuine question about whether parts interchange. However, whether the specific bulkhead pressing is identical between the GL X166 and GLS X166 is something you must confirm with the breaker against your exact registration, as mid-generation changes and badge-swap differences can affect panel fitment in ways that are not always publicly documented.
Yes, the GLS is exclusively a large five-door SUV across both the X166 and X167 generations, so there is no hatch, saloon or estate variant to worry about. The key fitment question is therefore the generation (X166 vs X167) rather than any body-style variation. Match the generation to your car and you have the main fitment basis covered.
No — engine and gearbox choice have no bearing on bulkhead fitment for the GLS. Whether your car is a diesel 400d, a petrol 580, or a hybrid variant, the bulkhead pressing is determined by generation and body structure, not what sits under the bonnet. Focus on confirming the correct generation with your breaker and you can disregard the engine specification entirely.