Put the R6 rear shock in today. Took a little modification but not too bad. I had to enlarge the top bushing hole, make some spacers, and trim the lower clevis. The R6 shock is slightly shorter, so I had to make new dog bones to keep the ride height the same. It feels really soft, so I'm not sure if that spring rate is going to work for me. It's been so long since I've ridden this bike it's hard to tell.