GMPartsGiant.com offers the wholesale prices for genuine 2017 Buick Regal parts. Parts like Roof Headliner 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 2.4L. Model Code: CX 4 DOOR SEDAN, CXL 4 DOOR SEDAN, CXS 4 DOOR SEDAN.