GMPartsGiant.com offers the wholesale prices for genuine 1990 Cadillac Deville parts. Parts like Lamps/Opera are shipped directly from authorized GM dealers and backed by the manufacturer's warranty. Parts fit for the following vehicle options. Engine: 8 Cyl 4.5L. Model Code: 2 DOOR, 4 DOOR, 60 SPECIAL 4 DOOR, CONVERSION.