GMPartsGiant.com offers the wholesale prices for genuine 2013 Cadillac CTS Wagon parts. Parts like Shift Control 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 WAGON, 4 DOOR WAGON(RHD), V 4 DOOR WAGON.