Rears are the same 70 thru 72. I purchased an AMD rear 72 for my 73 and it bolted up fine. You just don't have the extra bolt holes for the rubber bumpers (I didn't want them anyway). As you probably already know, the front bumper for 73 is one year only. I have a spare front and rear for a 73 if interested. They both need to be re-chromed.
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