First of its kind available to the public !! Turbo2NR.com Billet Aluminum carrier bearings for use with the RT4WD Honda Viscous Coupler unit and Driveshaft 88-91. These units will replace your OLD WORN OUT rubber parts and eliminate flex in the Drive train that can cause premature u-joint damage or Failure !! The design utilizes the factory mounting hole locations but can be easily modified for a more compact installation by the end user.