First, its on my 36, I built it with spare parts not knowing what this was. It has failed, now I need to know what it is, the master is ford, the pedal and pedal pad say ford, but the booster has no markings other than random numbers. Diameter is 10.5 cylinder studs 3 1/8 apart front corner # L281A middle bottom front J10 6373 JH 0031 3063698 Irregular mounting pattern on the rear. Its been on my old dog for 25 years, my 36 ford hoping you guys can help, internet searches haven't been helpful. Thanks, LeRoy.