Contact these people, best in the country for BP parts.
Turner Kirkland started Dixie Gun Works in the 50s or 60s and call them as to what parts you need IF you do not find them in their opnline catalog. Their shop personal are great and can tell you where to get the parts or they can make them in house. IF close to their shop, stop in because they have a museum of old cars, trucks, motorcycle, buggies, and guns that you will see in such a small town. Also order a hard copy of their catalog. It is $10 I think BUT the last 100 pages is a wealth of information on black powder guns including cartridge BP guns and cannons.
Hope this helps. Also a lot of CVA parts interchange with the jukars, I have a jukar 45 flint lock KY pistol.