Air Shock Question

The spacers would be easy enough to make. I have air shocks in my 65 Valiant wagon to help with the weight I carry up to my camp. You know ,camping gear tools generator chain saw .All that stuff is heavy. They bolted right in .I have a 7 1/4 rear but I can't see how that would make a difference .Had them in my 65 Barracuda to way back when .