Biscuit is making rear set brackets for the ZRX. Check out this thread. Will be about $70 delivered. I guess they fit both 1100 and 1200.
http://www.zrxoa.org/forums/showthread.php?threadid=95687&perpage=40&pagenumber=1
http://www.zrxoa.org/forums/showthread.php?threadid=95687&perpage=40&pagenumber=1