GMPartsGiant.com offers the wholesale prices for genuine 2018 Chevrolet Silverado 1500 Hybrid 2WD parts. Parts like Assist Step 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. Model Code: 1500 CREW CAB STANDARD BOX, CREW CAB 1/2 TON.