My boat Cal 9.2 had a set of Barient 25 winches. I wanted self tailing and scrounged Ebay for 6yrs until I found a pair of Barient 27-48's. They had the same base dia and drum dia as the 25's. I took a chance and found that they used the same base mounting holes. Just what I wanted.
Find out what the mounting hole pattern is , you might be able to find St40, St43(old design) or St44's with the same hole pattern. The old St43's are no longer supported by Lewmar if a part breaks. I like the Barient 27-48's, around 40:1 with a 8" handle and 48:1 with a 10".
Cal 9.2 #19 SilverSwan