GMPartsGiant.com offers the wholesale prices for genuine 2015 GMC Savana 2500 parts. Parts like Fuel Injector Rail are shipped directly from authorized GM dealers and backed by the manufacturer's warranty. Parts fit for the following vehicle options. Engine: 8 Cyl 4.8L Flex, 8 Cyl 6.0L, 8 Cyl 6.0L Flex, 8 Cyl 6.6L Diesel. Model Code: 3/4 TON CARGO SAVANA, 3/4 TON PASSENGER SAVANA.