I have a 57 Chevy p/u that is stock except I put in lowering leaf springs. It worked a little too well. It lowered the back 3 inches, but I'd like to have an inch back. I was told a relatively easy and inexpensive option is to replace the shocks with air shocks and pump it up that inch. GREAT! But... I can't find them. I know they use these on all kinds of cars and trucks including vintage ones, but I can't find one that says it fits my truck? I would think if nothing else there'd be a universal fit kit? Has anyone experience with this or know where I might find a rear end air shock kit? I'd really appreciate it.