You can buy a kingpin kit at NAPA complete with pins, bushings, plugs, thrust bearings, shims, lock bolts, nuts, and washers.
While I suppose you could only replace one It's almost always done in pairs, I'd do both while you're at it.
If you're missing a thrust bearing you may also need a new spindle and or axle if they're worn.
New king pins on a 1 ton will require reaming the new bushings.
Grigg
