The frame is the same from 1964-1967 EL Camino and Convertibles. Sedans and hardtops are not boxed. Other GM convertibles(Cutlass,Tempest,Skylark) will work by changing out the very rear frame brace towards the bumper, they have a different shape to clear the gas tank neck while yours has it on the side. Good luck, Joe Vega AzChevs.com