2 exchange-standard references match the MERCEDES GL-Class (X166) 500 435 hp (320 kW petrol). Output is the deciding criterion: a part meant for another output of the same displacement will not fit.
On the MERCEDES GL-Class (X166) 500 435 hp, the code stamped on the part remains the safest matching criterion.
Other engines of the MERCEDES GL-Class (X166): 420 CDI 306 hp, 450 CDI 306 hp, 350 CDI 265 hp. If the code stamped on your part is legible, search by reference remains the safest route. 24-month warranty.