GMPartsGiant.com offers the wholesale prices for genuine 2016 Buick LaCrosse parts. Parts like Fuel Tank & Vapor Canister are shipped directly from authorized GM dealers and backed by the manufacturer's warranty. Parts fit for the following vehicle options. Engine: 4 Cyl 2.4L, 6 Cyl 3.6L. Model Code: CX 4 DOOR SEDAN, CXL 4 DOOR SEDAN, CXS 4 DOOR SEDAN.