The bushings are in your spindles. When you buy the oversize king pin set, you aren't getting larger bronze bushings! You are getting a slightly large diameter king pin! That means you have to ream out the AXLE, not the spindles or bushings. So unless the hole that the king pin is mounted in in the AXLE is worn out, there is no need for oversize king pins. If your spindles are worn out they can either be replaced or you can bore them and have oversize bushings made and inserted.
