Characterized by the experienced as "As much an art - as it is a science", polyurethane continues to amaze the people who work with it. Body Cab Mount Set Black Performance Polyurethane. ABOUT THE MANUFACTURER .
The inner sleeve diameter is to small to fit the factory Datsun 510 Control arm bolt. You'll need to purchase a 13.5 mm drill bit and drill out the centers to use factory hardware.