With older, rotting or soft body mounts.. the loose feel just can't be repaired..
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 etc.. are made a little harder on purpose.. this is what ALSO makes "Energy Suspension" the world leaders in polyurethane technology.