Replacing single reservoir M/C with dual reservoir on four wheel drum system

none of the parts identified in the tables are for pre 67 because they weren't making dual masters until 67.

so, any 67~70 a-body drum master will work. which is what @66fs said in post #8

you'll more than likely need a different push rod, though. if you can't find an OG one, several vendors make adjustables that work great.