GMPartsGiant.com offers the wholesale prices for genuine 2018 GMC Sierra 2500 HD Denali 2WD parts. Parts like Spare Wheel Carrier are shipped directly from authorized GM dealers and backed by the manufacturer's warranty. Parts fit for the following vehicle options. Engine: 8 Cyl 6.0L, 8 Cyl 6.0L Flex, 8 Cyl 6.6L Diesel. Model Code: 2500 CREW CAB STANDARD BOX.