[dsraven]

here is what I did on my envoy frame swap project with a 57. maybe some ideas. I used rectangular tubing. my rad support bolts up to the brackets on the upper area that have the holes in their front sides and uses universal aftermarket urethane mounts from energy suspension, the rad drops into those flanges with the holes in them (stock envoy rad) on the inside of the frame extensions. the bumper brackets bolt to the front of the frame extensions which have holes drilled and tubes inside the extensions so the bolts don't collapse the extensions when tightened.