The brake pedal has a 3/8" stud on it. The Hydroboost has a larger eye. The eye needs to have an eccentric washer in it that holds the stud on the pedal against the rear of the hole. The washer can be welded in place. You may have to slim the eye area to keep it from binding.@Fred Kiehl For the hydroboost conversion do you need to edit the brake pedal?