I'd lurk over on rimfirecentral.com and see if anyone there has a source for the parts you're looking for. I know that there are several parts houses around that specialize in old rimfire rifles, but I don't have any specifics to share. I'm pretty sure there's still one in New Albany IN that carries all kinds of cannibalized parts off the oldsters. I wish I could help you more, but ask around on rimfirecentral, someone over there can probably help.
Same answer goes with your other post on the JCHiggins.
Last edited by ratsmacker; 02/03/23.