The frames are the same from front to rear of cab, so the radiator shim should be the same for all trucks 3100 thru the big bolts. The only difference is the COE's which have a subframe that the cab sits on.
For what It's worth, when I put my truck together, I used no shims under the radiator support, just the rubber pads (one thickness.) I had the cab at the specified distance between the frame and the cab floor front and back.


Kevin
1951 Chevy 3100 work truck
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1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.