67-71 hemi disc did not all use the same master cylinder. 70-71 is different than the earlier years as touched on in this other current thread.
https://board.moparts.org/ubbthread...cylinder-any-difference.html#Post2894348They all had 1-1/8” bores, and any MC kit for a Mopar from that era with a 1-1/8” bore can be used to pirate its seals to use to rebuild your master cylinders pistons if your pistons are in good condition to be cleaned up and reused.
The kit for 70-71 hemi masters with the 2229191 casting hasn’t been available for many decades so is very hard to find. I did have some primary piston assemblies made up through Raybestos for those a while back if anyone’s looking for one.
