Perhaps, not sure.

I've seen roller kits on Ebay for older Mopars on occassion, not sure about the '60/'70s stuff.

Just found a rollerbearing conversion kit on some Australian site, but at $130 I'm sure some thinkering in the garage could come up with a cheaper alternative.

I've converted the idler arm bushing on my '57 Chrysler to 2 nylon halves some years back;