Dan, I just followed your link to the GM Parts Wiki and was able to find the page you found!

It is kind of like magic! I am sure that some practice is required to maximize the returns, but I know that it will help me going forward!

Nick
1940 KC Model 1/2 Ton Pickup Project
(with '37-'39 Bed and what we think is a '42-'46 Frame)
Taos, New Mexico