Tensioner pads are a direct drop-in replacement for the factory cast tensioner housings as well as the billet Feuling tensioner housingsPads are injection molded Nylon with PTFE added to increase wear and friction resistanceTensioners are single piston, duplicating the output pressure of stock unitsReplacement pads include new hydraulic lash unitsFit inner and outer factory HD cast housings and Feuling billet housingsMade in the U.S.A.