* Significantly less expensive than bronze, with wet bolts. * More durable than nylon or bronze bushings. * Maintenence free. * Permanetly lubricated. Universal tandem kit includes: 8 - Shackle link plates 14 - Nut 7/16 - 20 14 Bolt 7/16 - 20 x 2-7/8 14 Never Fail Bushings.