Steve, I got the rearsets from someone in Germany who originally bought them from Bill, who is the guy who responded to your shock question. Bill made them, but they are probably one of the only sets of this type ever made, and I think Bill has since upgraded his design.
You can see them on his web site:
http://www.zabernet.de/bill/tuning.html
Scroll down a little bit and the first pictures are clickable, and if you click on the word "brackets" a drawing comes up for the left side.
Rear sets have always been a real problem. The only other usable thing I've seen is a beautiful set from Bikeworx/Axeljack, but lots of $$$.
I'm sort of looking for something as back-up, as no crash parts are available for what I have.
Chris