GMPartsGiant.com offers the wholesale prices for genuine 2016 Cadillac ATS V-Series parts. Parts like Antenna/Digital Audio are shipped directly from authorized GM dealers and backed by the manufacturer's warranty. Parts fit for the following vehicle options. Engine: 6 Cyl 3.6L. Model Code: V-SERIES 2 DOOR COUPE, V-SERIES 4 DOOR SEDAN.