Do You Restorers Replace the Styrofoam Inserts or Just Throw 'em Out?

And the beat goes on ...

I just found a factory Chrysler Parts Catalog in a storage box and this is what I found:
rubber item called rear bumper "stabilizer"
Part number Valiant 2266 525 (2)
Part number Dart 2266 547 (2)
Part number Dart Station Wagon 2266 525 (2)
Part number nut w/retainer 6000 123 (2)
Part number screw, shoulder 6023 977 (2)