A few question's first so that maybe I won't have to tear into the unit. A. What is the bore size of the brake side, what is the bore size of the clutch side? B. Where there different bores available for diff. years and or application?
Usual is 1-1/8 bore for both clutch and brake, swap the residual valve and good to go if firewall mount..I did have one that had a brake bore of 1-1/4 and clutch bore of 1-1/8 but don't know what the application was..