nope just used the stock rod for the 65 plymouth and I have the stock rod in my 66 also. I've done a couple of friends cars too and they all used the stock rod. (get a new rubber piece if you can that goes on the rod if yours is bad, I used an oring/oil and FORCE)
they even sent me a new pushrod boot in the master cylinder box too! first one I ever got with a master cylinder