I have an old luggage rack that came off my 1973 R75/5 but I have no idea who the manufacturer was, it came with the bike. Looks solid, chrome is pretty good for sitting many years! My guess is that it may clean up real nice. I've got a few pics on my Flickr page @: http://www.flickr.com/photos/woodly1069/
Let me know if you are interested and thanks for looking!