I pulled the master cyl off and it measures 1.060 right at the opening. I didnt remove the snap ring or the plunger so Im gonna assume it is the 1-1/32 bore. It originaly came with a 8-1/4 rear, now it has a 8-3/4. It stopped fine just they cylined leaked out all the fluid over the winter.. Ran down the firewall and messed up my pretty yellow paint.