the main difference is that there is a raised area in the inner brace with 2 bolt holes for the core support brace on the '73 and up fenders. Another difference is in the hood hinge area where the earlier fender have a captured nut while the later ones have slots with j-nuts for the hinge bolts.
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'72 Formula 455HO TH400, Revere Silver, black deluxe
'74 Trans Am SD 4 speed, Admiralty Blue, blue deluxe
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