I have an O'day 26 1984 that is in very good condition. there is a bail at the foot of the mast. on the underside of the boom is a bracket that I am assuming is for the boom vang to hook to. It is riveted to the boom and has a "key Hole" cut in it to recieve some sort of hanger that the vang block would attach to. any ideas? is this factory? where can I get the proper piece? thanks in advance...