What I have done in past is get some rearsets you like then just get some plates made up that fit the frame and rearsets. These were some i had made to fit gsxr K4 rearsets to fit a bandit
I ran a 525 on my drag bike it got abused all the time constant wheelies I ran 28 times at east Kirkby one meet and trashed a brand new tyre but never had to adjust the chain very good well worth the extra money in my view