Like I said hooked breech easy to find, it would open you up for a lot of other barrels. Like $20 on ebay. Them traditions barrels generally have the same underlug position, most all of them came from Spain anyway...
Bobcat, plainsman, frontier, same tangs....same 15/16 barrels...same underlugs 5 11/16 's from end of barrel. Ebay full of them. There's fair unused, decent used...take your pick. You want me to post you some links?
Don't know what condition you are looking for or whether you care but I have a barrel that WOULD fit. PLAINSMAN by CVA made in Spain. Button tang, 15/16", 50 cal, underlug is 5 11/16" from end of barrel. Rough outside and inside, scuffed, and a little pitted. Shoots good though. $50 plus shipping