Modern replacement for treadle vac booster/master cylinder

[MaravillaMike]

I have owned several 1957/58 Mercury's with the Bendix Treadle Vac brake booster. I constantly have problems with them. Presently my 1957 Monterey booster/master cylinder is out. Pedal goes to floor. It is full of brake fluid. I have searched for a modern replacement but those found say they will not fit a 1957 with 312 V8 and original exhaust manifolds which my car has. Does anyone know where I can buy one that will fit? Thanks...Mike