GMPartsGiant.com offers the wholesale prices for genuine 2021 Cadillac CT5 parts. Parts like Rear Differential Carrier 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, 6 Cyl 3.0L. Model Code: LUXURY SEDAN EXT, SEDAN EXT, SPORT SEDAN EXT, V-SERIES SPORT SEDAN EXT.