Dear Joe and mid-60s Buick electricians,
Thanks, I would like to get a set but may have to rebuild mine.
What is the condition of your housings? If the housings are in good shape, as noted in the article, sandblasting them will bring out the clean metal. If you don't have a sandblaster or beadblaster, you might be able to find someone who could do this for you.
The remaining part of the work is really very easy. If you scroll down that thread, there is even a NAPA part number for the replacement contacts. It will take an hour or so, but it isn't a royal pain like restoring so many other components turn out to be.
Cheers, Edouard