King Shock Replacement "BUNA" O-Ring and Seal Kit for 2.5" Performance Series (Pre-Runner) Shocks These o-rings and seals are used to completely replace all of the o-rings and seals that came on your King 2.5" Performance Series (Pre-Runner) Shock from the Factory. Can be used on all King 2.5" O.E.M. Replacement Coilover Kits on the Tundra, Tacoma, F150,Nissan Titan, Chevy... All you will need is oil and some time!!!