After talking to Dr. Diff he recommended using a 15/16" bore m/c on the Duster with 4 wheel disc brakes...Mine are Wilwood...

I used the same m/c and 4-2 bolt plate on the 69 Dart with factory 76 A Body disc brakes and 10.5" drums on the rear...

Both cars stop excellent with good pedal feel... twocents


...FAFO...