Rear Spring Plate PolyBronze Bushing Set, 1968-89 911/912/930 $315.00 FEATURES: Replace your compliant factory rubber bushings with these PolyBronze bushings for precise and friction free suspension operation. No squeaking or binding that is commonly associated with rubber or Delrin bushings. A high precision steel sleeve presses onto the spring plates for the bearing ID.  For the bearing OD, another precision bronze sleeve presses into the factory bushing carriers. A urethane outer liner on the outer sleeve absorbs and minimizes road noise and vibration. The built in grease fitting distributes grease evenly through the figure 8 groove in the outer sleeve.