Many Panteras, I dare say most, have doors that do not fit properly. Among the more common issues is striking, or rubbing, of the extreme top rear of the window frame on the trim piece. Mine had evidence of this problem also:
I attempted to fit up one of the old doors, to take some measurements and see if this problem could be due to poor adjustment. At this point, I realized that I could not get a repeatable adjustment, and so made the door hinge adjustment modifications I detailed earlier.
Here I have put the old door in place, and found that I could (just barely) avoid the rubbing problem with careful adjustment. Notice in this pic the door to body gap, also the window frame gap is uniform:
Here is a new door in place, again after careful adjustment. Not easy to see in this picture, but the door to body gap is uniform, but the window frame gap is not. It is wide at the bottom, and tight at the top. The rubbing cannot be adjusted out:
After a couple of weeks of screwing with this, trying every trick I could think of, I finally decided the only way to fix the issue was to warp the window frame ever so slightly. To do this, I had to cut the window channels in each corner, only enough to weaken them:
With a Dremel tool and the finest cutting disks, I sliced into each corner. You can imagine this caused some real heartburn. If I messed up, I could ruin the doors I just bought. Then I rigged up a turnbuckle to put pressure inside the frame, and warp it until the rubbing problem was solved:
Finally, I welded up the cuts to restore the strength and hold the shape.
In case you were wondering, the left (drivers) door had the same problem, and had to be done also.
So now you know the rest of the story.