GMPartsGiant.com offers the wholesale prices for genuine 1999 GMC K1500 parts. Parts like Wiring Harness Front Lamps With Connectors 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, 8 Cyl 6.5L Diesel. Model Code: K1500 EXTENDED CAB STANDARD BOX.