Steven,

Here is the link you described earlier:
http://olive-drab.com/idphoto/id_photos_gmc_afkx.php

A little googling came up with this, it may be of interest to you.
http://g503.com/forums/viewtopic.php?f=25&t=165843&start=0

If you post on the G503 website under either the 1/2-2 ton or 2 1/2+ section, you may find someone who has more information on your GMC. The above site seems to have more folks that are interested in WW2 vehicles; however, lately there has been very little activity. I recall someone on stovebolt finding a AFKX maintenance van a year or so ago.

Looks like unearthing parts for the GMC will be difficult but not impossible, I hope you are a man of great patience. Finding a parts manual will greatly enhance your parts acquisition success. I have found that early WW2 vehicles (1940-41) tended to "borrow" many parts from their civilian cousins which will greatly widen your spare parts universe.

Good luck on your project and I hope you get time to play with your trucks.

Paul

1941 Chevy 1 1/2-ton WW2 4x4 dump truck
In the Stovebolt Gallery
Lots more pictures