This is at the core of our Rear Shock Needle Bearing Kits. Perfect for installing into a backup shock you want ready to slip into the exisitng hardware. Also, when you replace your shock, it's best to replace this "cup and roller assembly" because the cup will not fully "rebound" to it's pre-installation Outside Diameter. By purchasing just a new bearing and re-using all of the other hardware, you can save a considerable amount of money.