1965 Barracuda MC conversion to Dual Resevior - Push Rod Question

Or you can get a newer style two bolt master cylinder with adapter from Dr. Diff. These are what I run in all three of my Cudas. He has 1 1/32" and 15/16". And I used the stock pushrod, but you can get an adjustable rod from various places.
http://www.doctordiff.com/aluminum-master-cylinder-kit.html