Just uploaded pictures of the thin bushings and fitting the stock (replacement) 2 ton kingpin bushings in them.

this album
https://picasaweb.google.com/118082002072608219229/2TonDiscBrakeUpgradeForOldGMTrucks

Here are the bushings
https://picasaweb.google.com/118082...pgradeForOldGMTrucks#5830825462749288338
As you can see the bushings that come in the P-30 spindles can be bored/reamed to accept the 2 ton bushings.
More pictures in there of reaming as well.

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
---All pictures---
"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-