New Energy Suspension shock reservoir isolator bushings.  These are for universal applications, this will fit a 1.5" shock and 2.5" reservoir (or vice-versa).  These isolators sit between the shock and reservoir and are clamped around the shock/reservoir (clamps not included), see photo #2.  Sold as a pair (2 isolators) which only 1 does 1 shock, so multiple units will need to be purchased if installing on more than 1 shock.  These are red polyurethane, which has less flex than rubber.  Universal applications.  View other sizes for different tube sizes.