GMPartsGiant.com offers the wholesale prices for genuine 1991 Chevrolet Caprice parts. Parts like Engine Assembly-Manifolds & Fuel Related Parts are shipped directly from authorized GM dealers and backed by the manufacturer's warranty. Parts fit for the following vehicle options. Engine: 8 Cyl 5.0L, 8 Cyl 5.7L. Model Code: 4 DOOR, STATION WAGON.