You could, but consider the vent window contains the guide channel for the front of the glass in the earlier door. On the 73/4 doors the front window channel is welded into the front area of the door shell. If you were to convert the 68-72 door shell you'd need donor 73/4 doors for the guts that you could weld into the earlier shell. It's possible but a little counter productive when essentially all you need to do is pull two hinge pins, switch doors and you're good to go.
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-Ben, Creative Director
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