Hooker BlackHeart has quickly become the leader in LS engine swaps and we are excited to offer this crossmember for 1968-1972 GM A-Body Convertible and El Camino vehicles with LS engines. The crossmember is specifically designed to fit the narrower, boxed frame rails of the A-body Convertible and El Camino models. It is compatible with our current 1968-1972 A-body LS swap engine mounting brackets (71221006HKR and 71221007HKR) to provide optimized engine fitment and U-joint operating angles.