67 - 71 doors have short windoe regulator shafts...the shaft that the window crank goes on.
In 72, they had long shaft regulators, and a small screw under the wing vent to help battle the doors splitting. There may be a few minor differences due to the plastic panel, but that could probably be solved with a drill.
The panels couls be swapped with the addition of the window regulator and the posability of drilling a hole or two.
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