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GMPartsGiant.com offers the wholesale prices for genuine 2018 GMC Sierra 2500 HD Denali 4WD parts. Parts like Sensor System/Forward Collision-Camera 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.