GMPartsGiant.com offers the wholesale prices for genuine 2011 Cadillac CTS Sedan parts. Parts like Lamps/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 3.0L, 6 Cyl 3.6L, 8 Cyl 6.2L. Model Code: 4 DOOR SEDAN, 4 DOOR SEDAN(RHD), V 4 DOOR SEDAN.