Are you trying to stay bone stock? Otherwise I respectfully suggest an upgrade to a dual master cylinder using a bracket adapter and the stock pedal. The numbers pencil out versus sleeving the old "one shot" master and the extra safety factor is well worth the investment. There are a lot of threads that cover this ground. Just my two cents after spending a lot of time honing old masters and trying to save dimes. There is nothing worse than that feeling when the pedal goes to the floor and the rear bumper of the lexus in front gets real close... cool