The damper can be purchased from the same palce you got the king pins. The damper kit contains the damper and the metal washer on top of the damper and the dust cap. They were about $12 each. I set the bearing preload without the dampers so I had a few thousandths play then put it together with the dampers. When I called a few Bronco place and asked how they set them up they just put them back together with the shims that were removed. That didn't sound right to me so I set it up the way any bearing should be set. Theroreticly a tapered roller bearing in a near static situation should have a few thousandths preload rather than clearance. Without the clearance tho the damper would not be very effective. Buy the way I had to change all the bearing shim packs conciderably.