GMPartsGiant.com offers the wholesale prices for genuine 2018 GMC Acadia AWD parts. Parts like Seat Assembly/Rear Bucket-RH Cushion are shipped directly from authorized GM dealers and backed by the manufacturer's warranty. Parts fit for the following vehicle options. Engine: 4 Cyl 2.5L, 6 Cyl 3.6L. Model Code: DENALI SUV, SLE SUV, SLE2 SUV, SLT SUV, SLT2 SUV.