GMPartsGiant.com offers the wholesale prices for genuine 2021 Buick Envision AWD parts. Parts like Trailer Hitch Platform Package 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. Model Code: 1SC 4 DOOR SUV, 1SL 4 DOOR SUV, 1SV 4 DOOR SUV.