GMPartsGiant.com offers the wholesale prices for genuine 1987 Buick Lesabre parts. Parts like Automatic Transmission Case Bolt Location are shipped directly from authorized GM dealers and backed by the manufacturer's warranty. Parts fit for the following vehicle options. Engine: 6 Cyl 3.8L. Model Code: 4 DOOR, CUSTOM 2 DOOR, CUSTOM 4 DOOR, LIMITED 2 DOOR, LIMITED 4 DOOR.