Rubber or Poly for a Daily Driven Corner Carving Street Machine?

The poly bushing is really a plain bearing. And the shell is the race. And a bearing needs a particular fit between it OD an the race ID. Problem is the ID of the shell (race) is a moving target. It varies per supplier (Moog vs TRW vs Mopar vs ...). The ID of the shell can also change the way a person presses in the bushing. They can go in sideways, ballon inwards, etc.

The delrin bushing/bearing uses the Machined ID of the LCA. That machined ID of the LCA is much better than the stamped sheet metal outer shell who's ID was never meant to have any precision.