Ted, I'm in South San Jose, and I think one of my rear drums may be warped. If they are compatible it ay be easiest for me to drive out and get them for a few bucks and lunch in Morgan Hill. Mine is a 70 IRS pan. Looking at parts on-line I think 65-67 rears may not work on a 70.
Ted's drums may be wide 5, while yours may be 4x130mm if they are both original to their respective pans, so make sure you know what you have.