Looking at the '73-4's again, it's not so much the shape of the openings (which look mostly symmetrical, save for the height difference) but rather the area around the openings in the quarter panels and fenders- smooth on the fenders, and with a flattened, radiused area on the rear quarter panels.
I actually like that about the rear quarters... I like how the body line flows from the front fenders down into the rear quarters... but I'm not here trying to sell '73-/74s to anyone.
The only thing I don't like is the lack of parts...
