I purchased my 1982 450 Nighthawk fifteen years ago from the original owner. It came with two sets of luggage rack support brackets. One set fit my Nighthawk perfectly and the other set did not. The bracket would hit the side cover but the bolt holes lined up. I was cleaning up my shop and just found them after all of these years. I would assume that they are for a CM450 of the same year but I am not sure. One of the brackets has stamped in it "MC" then under that "HK31". Could anyone enlighten me as to which bike they would fit and a value? Many thanks!