It really seems like nobody is making them. I found a generic spring that looked like it could fit on Summit and I called their tech support to see if I could learn the specs. They said that it probably wouldn't work and that he would see if there was one made for our A-body application. I was on hold for 10 minutes and he came back with the "Happee Feelnigs" email address that he probably got from this forum.
I'll take a look over at Moparts before I do anything drastic :D
