You'll probably have to have your CSR seat modified. It's marginally possible that maybe an 80s 1000-Standard seat might fit, but that would be just a hopeful guess.
Sargent Cycle
in Florida might be a good place to try. Kinda pricy, though. They have a website w photos n stuff, including a
case study
redoing a CB750 seat. I haven't used them & I've only heard of one or two here who have, but they were very satisfied. But that was several years ago. You can call them.
HenryJ
(sp?) here a few years back had a seat done by an aircraft upholsterer for cheap.
