Leaf spring woes

My problem is; the rubber bushings are worn out on my procomp 4 inch lift springs, and I can't seem to find any replacements....I wanted polyurethane bushings so I ordered some for a Cherokee only to find out the stock springs have much bigger bushings than the procomp springs.....So I tried to get poly bushings for the procomp springs but I am told procrap doesn't make them......The place I bought these from has not been much help....Anyone know if most of the aftermarket springs use the same size bushing? or any other ideas?

meause them and call daystar???