Energy Suspension's Polyurenthane Formula's & testing are industry best.. world class.. and this kit specifically for the 63-69 Corvettes is no exception.
The kit (similar to picture) does all the chassis, both sides and comes with the washers and sleeves.
Exceptional value.. again .. factory direct access.
Note: Not all polyurethane is the same in these kits.. Body to Chassis mountings are made of a slight softer chemistry to allow them to take road vibration & reduce the harshness otherwise felt. The other control arm bushes ect.. are made a little harder on purpose.. this is what ALSO makes "Energy Suspension" the world leaders in polyurethane technology.