You may be able to use the bags, but those mounts are for the monolever frame bikes (R65/R80/R100) that started with the 1986 model year. Â They won't work on your 81-84 twinshock R65 frame. Â Â You need to find R65/R45 specific mounts for the twinshock frame, vintage 1979 - 1984. Actually, now that I think about it, those bags may not work with the twinshock mounting frames either - I can't tell from the pics, but they look like the bags I had on my 88 R100RT, and I think that the have a locking clasp on the front edge that is supposed to grip the frame mounts on the monolever bikes?