1973-1987 Chevrolet C10 C20 C30 R20 R30. Although you can weld them up as well if you prefer. 1973-1987 GMC C2500 C3500 R2500 R3500.
[SR] Rear Axle Lowering Universal Mini C Notch Kit /Frame Notch /Under bed Notch
[SR] Rear Axle Lowering Universal Mini Truck C Notch Kit / Under Bed Frame Notch
[SR] Weld-on Lowering Truck Under Bed Frame 10" Tall Step C Notch Kit 3" Wide
[SR] DIY Weld on Rear Axle Lowering Universal Truck Under Bed Frame C Notch Kit
[SR] C-Notch Rear &Lowering Drop Flip Kit 88-98 Chevy Silverado C1500 GMC Sierra
[SR] DIY Weld on Square C Notch Kit Universal Air Ride Suspension Bagged Airride