Great idea! I wish I'd seen your suggestion when I needed a set for my TJ Sport years ago. Although it may have been hard to find any hockey pucks in rural Texas at the time!I use hockey pucks and save money for other goodies. Drill and taper them, then get some cheap bolts. This has worked for ten years, with no issues.
https://www.dickssportinggoods.com/...Vgp-zCh32jQtZEAQYBCABEgIeefD_BwE&gclsrc=aw.ds