GMPartsGiant.com offers the wholesale prices for genuine 2020 Buick Envision 2WD parts. Parts like Fuel Supply System are shipped directly from authorized GM dealers and backed by the manufacturer's warranty. Parts fit for the following vehicle options. Engine: 4 Cyl 2.0L, 4 Cyl 2.5L. Model Code: 4 DOOR BASE, 4 DOOR PREMIUM, 4 DOOR PREMIUM 2, 4 DOOR UPLEVEL.