Merle - thanks for the info. The NAPA p/n checked out at the local store, and they said it was a special order and would take a week. I called Rare Parts in Stockton and they now stock king pin sets for our trucks. One day later, the kit is in hand!
See pics below for comparison. On the left is the import, on the right is from the home team.
This one is very high quality and blows the import kit out of the water. The pins are made by Trayer in NY, and the bearings are stamped "Irwin Bearing Co Cinti. O.". The pins are very hard steel like the original and slip into the axle eyes with ease. Now just have to re-do the bushings in the spindles and we'll be in business.
As has been said before on this site, Rare Parts sells only high quality, USA-made parts, and they have Drag links, Tie rod ends, spring shackles, shocks, and king pins for our trucks. They make many of their parts in-house, often with improved design and matl's from OEM. Highly recommended!