I had found a link on here once that went to a write up on leaf springs, and how geometry affected them, along with shackle position and length.

The host of that writeup was a company that sold circle track products. In fact the write up focused on circle track leaf springs.

I found some "pivot bushings" that were basicly like a johny joint, but designed specificly for a leaf spring. Those are what I'm looking for.

I would've done a search, but there are about a million posts for leaf springs, and this was just one little link someone put up.

thanks

Looking for these?

http://www.aor4x4.com/orbit-eyepoly-eye.htm