going back to manual disc brakes from power

Thanks, I also have the adapter plate coming. Dr Diff's description claimed the original rod would work but I won't be surprised if that's not the case. While searching, some said it's fine and some said you need an adjustable. It seems nothing is ever easy in Mopar-land.
The original drum brake pushrod is fine. If the master you ordered does not come with the rubber lock ring you’ll need it. The rubber bellows doesn’t really fit well with the aluminum 2 post master anyway. It’s just a dust seal of sorts. These cars of ours aren’t daily drivers and seldom see inclement weather. Not a concern for me.