John
Try Mastermind in CA. He has rebuild kits for the Brougham valves (they are different of course) and parts for the 59 & 60 versions. He might be able to help you. I lost my computer, so I do not have the link handy, but if search with Mastermind.net, you should be able to find is site. Try emailing as his phone answering machine does not work very well.
David
I have spare RR valve, but I'm sure it needs a rebuild as well.