Hy again Joe Alan, I found a dual circuit master cylinder with a 1 1/4" bore, it looks like it was designed for a drum/drum system. Raybestos MC36359 $59.79 at RockAuto. I think you'll find your braking effort will be less of an effort if you install a booster in front of the master cylinder. If you look at some of the vendors websites I think you might find kits including brackets.