GMPartsGiant.com offers the wholesale prices for genuine 2021 GMC Canyon 4WD Extended Cab parts. Parts like Lamps/Rear 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, 4 Cyl 2.8L Diesel, 6 Cyl 3.6L. Model Code: EXTENDED CAB - 6'2" BOX, SLE EXTENDED CAB - 6'2" BOX, SLT EXTENDED CAB - 6'2" BOX.