GMPartsGiant.com offers the wholesale prices for genuine 2020 Cadillac XT4 AWD parts. Parts like Antenna/Auxillary Wireless Communication 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. Model Code: ALL PURPOSE 4 DOOR BASE, ALL PURPOSE 4 DOOR LUXURY, ALL PURPOSE 4 DOOR SPORT.