GMPartsGiant.com offers the wholesale prices for genuine 2007 Cadillac CTS parts. Parts like Suspension/Rear are shipped directly from authorized GM dealers and backed by the manufacturer's warranty. Parts fit for the following vehicle options. Engine: 6 Cyl 2.8L, 6 Cyl 3.6L, 8 Cyl 6.0L. Model Code: 4 DOOR, 4 DOOR RHD, V 4 DOOR.