Replacement Leaf Spring Friction Pads?

I am currently rebuilding my leaf springs with new poly bushings etc and all the plastic friction pads are crumbling apart. Is there a replacement available? Does not have to be exact replicas, any replacement will do! Any suggestions as to where to get them and what works? Car is a 1966 Barracuda..stock springs. Most of the pads have the two nubs on them that set inside the springs...

Thanks!
J