Last i checked (about 3 years ago) the Bushing that goes on the ball end of the shifter was no longer available.

It was made from some kind of PVC Plastic, so i made my own from a piece of clear PVC Tubing. (The Off-white/semi clear kind) That was about 6 years ago, it was still in the truck when it died. I popped the shifter out and installed it in my diesel (with some mods to the shifter to make it longer), still no wear on the Bushing.