When comparing apples to apples, I'd think a 73 is a little lighter than 74-77 because the 73's were only required to have the 5 mph bumpers in the front, and not in the rears. It wasn't until 74 that they were required to have both front and rear 5 mph bumpers. So, the 73 rear bumpers were somewhat lighter than the others.
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Steve F.
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