I've some NOS spares that came with my '66 Impala that I won't be needing. I've got them listed on kijiji for a few bucks, but really I'd just like to see them out of my basement and hopefully put to good use!
I also have couple of used 1" bore single outlet master cylinders, again from '66 B-body (w/power brakes). Both were used with DOT 5 fluid, and best to assume they will need to be rebuilt. https://www.kijiji.ca/v-view-details.html?adId=1545343244