GMPartsGiant.com offers the wholesale prices for genuine 1999 Oldsmobile 88 parts. Parts like Carpet/Floor 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: 50TH ANNIVERSARY 4 DOOR, LSS 4 DOOR, ROYALE 4 DOOR.