There is plenty of material around like that from all major suppliers in rod form.
If you are super careful you can cut the old ones off and reuse them, bore them out first, I have done it many times with Adam cues, etc. You can build them back up with superglue or epoxy to match metal...
Best book about the 20th century I have ever read. It must be in public domain because it is on archive.org
https://archive.org/details/mcgoortybilliard0000mcgo