other years wont fit, they redesigned the rear sets in 06 for the 600/750 and made them adjustable.
try
www.oneidasuzuki.com.. maybe other online places. i checked around on ebay and basically only found this...
http://cgi.ebay.com/ebaymotors/06-gs...QQcmdZViewItem
but maybe with some more time you can find one, i just did a quick search..
theres always adjustable rearsets? maybe check race forums. alot of guys buy rearsets and practically give the stock shit away.
nesba.com has a forum i believe.
hope that helps.