GMPartsGiant.com offers the wholesale prices for genuine 2018 GMC Sierra 1500 Denali 4WD parts. Parts like Radiator Assembly are shipped directly from authorized GM dealers and backed by the manufacturer's warranty. Parts fit for the following vehicle options. Engine: 8 Cyl 5.3L, 8 Cyl 6.2L. Model Code: 1500 CREW CAB STANDARD BOX, CREW CAB 1/2 TON.