Specifically Engineered For 1963-1972 Chevy C10 Long Bed To Short Bed Shortening Conversion Kits. For Chevy, For GMC C10 1963-72 Welding Required. Will Also Work on 3/4 Ton Coil Spring Trucks, 67-72 3/4 ton trucks will require changing the Cab Mounts to 1/2 ton C10 Mounts.