Is there a plumbing supply clearinghouse for old toilet tanks? We have a thirty-year-old
Crane wall-mount with a broken tank - would love to retain the current bowl.

Just Google this outfit and you'll see tons of old toilets. You will likely get other links to. https://www.askmehelpdesk.com/lawn-garden/how-do-repair-broken-concrete-lawn-ornament-237025-new.html