Here's some measurements for you. I tried to measure from the door post weld locations, which are a little fuzzy. It seems my cab is just a touch asymmetrical or the center strip is just a bit off center. Weld checking dimensions from the FAM are typically only good to +/- 1/16", so these should get you in the ballpark.I also added a couple dimensions to windshield flange from the center of the rear window (lower flange), which might help you keep things lined up.

Let me know if you need clarification on any of these or another dimension or two.
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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.