GMPartsGiant.com offers the wholesale prices for genuine 2017 Chevrolet Express 2500 parts. Parts like Auxiliary Heater Wiring Harness are shipped directly from authorized GM dealers and backed by the manufacturer's warranty. Parts fit for the following vehicle options. Engine: 4 Cyl 2.8L Diesel, 8 Cyl 4.8L Flex, 8 Cyl 6.0L Flex. Model Code: 3/4 TON CARGO EXPRESS, 3/4 TON PASSENGER EXPRESS.