68 c10 drivers window size

[Mruss70]

I have been working on this door gap forever. Then I noticed that the measurement at the front was 17 5/8 and at the back of the window was 17-17 1/4. Can anyone tell me what the opening size is for the door windows. It looks like someone may have tried to fix the front of the window. I also noticed that the chrome trim on the vent window does not go all the way from top to bottom. See the picture I have included for better explanation of what is going on.
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[RustyPile]

Judging from your "partial view" picture, it looks like the door is too high.. How is the bottom gap along the rocker panel?? I'm not sure what GM's tolerance is/was for the window opening. The trucks were intended for use as work vehicles, farm trucks, towing jobs, etc.. As such, the fit-and-finish was very lax... The front, measured at a right angle to the top of the door skin to the bottom of the window channel is 17 1/4".. At the rear, again at a right angle to the top of the skin to the point where the downward curve starts is 17".....