I have the Bikemaster brand 'race bike spools' on my Ninja and they clear fine.
The Pitbull stand I got works fine too now that I got rid of the rear fender. With the fender on the handle on the stand hit and you had to mash the fender forward to get the stand under the bike. PITA plus when you pulled the stand it would twist before it shot out backward. I have some nice gouges in my swingarm from that.
It's not the diameter of the spool that's the problem, it's the length. ( insert NSFW comment here... ) If the spool protrudes much past the allen head that secures it to the swingarm it will contact the left muffler when the suspension compresses.
I did a quick measurement this morning on the way out and they're .910" +- .010". Hard to get an exact without pulling one since the end is tapered. It looks like they may touch the left muffler ever so slightly but it's hard to tell. There's no dent or large scratches on the muffler. Make yours a little shorter and you should be good.
A forum community dedicated to Kawasaki Z1000 motorcycle owners and enthusiasts. Come join the discussion about performance, parts, troubleshooting, maintenance, modifications, classifieds, and more! Open to the Z800 and Z900 models too!