Try Bacons in Annapolis, Ebay, Craigslist
Greg,
The Barient #10 should be easy to find, they made a lot of them.
I was just in Bacons on Monday. They have an entire shelf of non ST winches. Lots of smaller ones. I would call them, 410-263-4880 and ask. They can check the condition and function and they ship. They are only open during the week in the winter.
Their website used to list a lot of the stuff they have on consignment, but its no longer up to date.
I found a few pairs on Ebay.
I also found some on Craigslist.
I know Bacons will sell a single. Compare all three for price.
All three of these are my go-to places to find old boat stuff when I can't (don't want to) use new.
Last thought, Does it makes sense to upgrade to a larger winch or a self-tailer or both while you are doing this?
Mark