I'm not sure if this is what Mr. Putnam is referring to, but it's possible...Mustang GTs, starting somewhere around '84 ('85 fer sure) had such a dampner attached to a bracket welded to the rear & another on the frame. Check one out!
BREAKING NEWS! It just so happens I've come up with a drawing for the Mustang damper from one of my Helms manuals. It's in Gif format, I don't know how to post it. Send me an e-mail at
dankirsch@surfbest.net, and I'll send you a scan.
Dan