They are rare, and frequently stolen... They have a nasty habit of falling off. If you still have it, then fabricate some means of re-mounting it, using a bolt, or a zip tie, or some-such. If you need to fabricate something, check my post in the tech section, lower portion of the Home Page: found a link to a discussion on how a fellow fabricated a side cover using a portion of a bumper off of a truck. Cheers!
1979 CB750K (sold, 2012, but not forgotten)
1983 Kawasaki 440 LTD Belt Drive (sold, 2011)
1993 Kawasaki Voyager XII