GMPartsGiant.com offers the wholesale prices for genuine 1991 Buick Regal parts. Parts like Automatic Transmission Park Lock & Inside Detent Lever are shipped directly from authorized GM dealers and backed by the manufacturer's warranty. Parts fit for the following vehicle options. Engine: 6 Cyl 3.1L, 6 Cyl 3.8L. Model Code: 2 DOOR, 4 DOOR, CUSTOM 2 DOOR, CUSTOM 4 DOOR, LIMITED 2 DOOR, LIMITED 4 DOOR.