I'd like to know too. I went to my usual guy and his spicer catalog didnt show the bushing or the king pin but he knows what I'm talking about. He told me to go to the chevy dealer. I stopped at autozone on my way home and their computer says it is a non-replacement part. So I just ordered from my chevy dealer: pressure springs, 14.48each, and the tapered bushings, 9.97each. I'm gonna try without changing the king pins but they were something like 68 bucks each. That's my two cents anyway.