GMPartsGiant.com offers the wholesale prices for genuine 1999 GMC K1500 parts. Parts like Lamp/Spotlight 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.