I have an '86 FXR, and I would like to upgrade the rear brakes. I was told once, that there are aftermarket twin piston calipers that will fit the stock bracket. Does anyone know if this is correct? And if so, does anyone know what brand makes these? If I have to buy a whole setup, bracket and all, then I suppose thats just what I'll have to do, but I like to keep as much stock parts on the bike as possible. Thanks in advance for any advice.