how big are the holes ? you are going manual brakes, correct ? does the master cylinder have the recess in the piston ? any of these i have touched in my lifetime has been 5/16" studs, but i never really popped out studs to compare the knurl. maybe your replacement is kind of generic ? don't forget, you dumped off a master here quite a while back. we can compare it to what you got now. [and i got MORE floor . ]