Hey Caleator, quick question looking at the close up of the RH side of your bike -- the part that mounts on the axis that connects the rearset lever to the master cylinder - it has a piece that juts off at an odd angle along the bottom - is there where the return spring mounts? Didn't see a spring in your photo.
I know this is kind of an old post now but- Thanks for the write up, Caleator! I never did get around to installing rear sets on my gpz. Glad the whole model number thing got figured out and now that info lives on the web. Not sure why I can't see your attached pics. Too old of a post maybe.
I just purchased a set of these off FFTP, but for my '81 KZ750e. The website listed them fitting only an '80, but research proved the '81 was identical. I haven't gotten to the linkage yet as the bike is still being built. The rear brake linkage I can't use, as my rear cylinder was shot. As soon as I fab up a mount for the new MC, I have to design my own linkage. As for quality, these are very well made pieces. I was surprised there was no shift linkage parts in the kit. I will have to modify the stock shift lever to get that hooked up. Overall I am pleased with the quality, though. I got the knurled folding set. Not a post that helps the original thread much, but thought I would chime in with my experience with FFTP and Tarozzi.
'81 KZ-750 E1
'86 Suzuki Savage 650