For optimum performance from the Accessory Belt Drive System, every component is critical, including the hardware. Whenever you replace a Tensioner or Alternator Decoupler Pulley (ADP), perform a complete and trouble-free repair by using the correct hardware. The Accessory Belt Drive Hardware Kit includes OE-quality bolts, spacers, bushings, dust shields and other fittings needed for most Tensioner and ADP repairs.