Fits the following 1999 GMC C3500 Submodels:
- C3500 CAB CHASSIS 135.5, C3500 CAB CHASSIS 159.9, C3500 CREW CAB LONG WHEELBASE, C3500 EXTENDED CAB, C3500 REGULAR CAB, K2500 EXTENDED CAB STANDARD BOX | 8 Cyl 5.7L, 8 Cyl 6.2L Diesel, 8 Cyl 6.5L Diesel, 8 Cyl 7.4L