I have a 1980 CM400T and just upgraded from single piston to Dual piston brakes. Most any of the dual piston bikes from the later years will work as long as you make sure you get the bracket as well. I used a Honda VT 1100 Shadow 1985-86 front left dual piston w/bracket and worked like a charm. Also compared it to the CM400C dual piston brake and it's identical. I also believe certain models of the Goldwings had dual pistons. You just need the left one of course. I hope this isn't all old news to some and this helps someone out.