This is Rubber with the shells.. not polyurethane.. this is more like the originals but made of rubber formulated 50-60 years later.. while it should outlast most of us under normal driving conditions.. todays "rubber" is likely to be found softer then it was when the car was new.
This is the rear upper and lower control arm kit for the 65-68 Full Size Chevy Belair or Impala or Pontiac Parisienne or Laurentian.
This kit is for cars with TWO upper rear control arm not just one. Two of the bushes are different sizes.. 6 are the same.