Well I thought I had found a bolt on solution to our rearset problem. After measuring the bolt centers on the stock foot rests without a whole lot of precision, I came to the conclusion that they were 70mm apart. Surely they aren't something like 69 or 71. So I set about looking for bikes that are currently having aftermarket rear sets made that are 70mm and have somewhat similar foot peg position in relation to the mounting bolts. After a few days of looking around, I found the RVF400 and a manufacturer making decent rearsets for it. I determined by sight and reckoning that the stock foot peg position could be closely replicated by switching the multi position mounting plates on the aftermarket units to the opposite side of the bike, upside down. Turns out they are about an inch further back. Pretty darn close. BUT.........Sure enough, MZ has a weird bolt spacing on the bike frame, just far enough short of 70mm that I can't get the bolt to thread in. It has to be 69mm. So no direct bolt on. I'm probably going to have to drill the threads out and just use the supplied nut to back up the bolt on the inside of the frame. They are pretty decent looking sets though and are a lot less expensive than the top of the line units.
http://www.sesraceproducts.com/adjustab ... 4-47-p.asp