The thicker bars might have been part of the 73 crash standards they had to meet,
once the 75-75 bumper was used they might have used a thinner bars to save some weight/cost.
The 74-75 front "battering ram" ....I mean bumper is stronger than the 73 set up so the fender bars were less important in a crash and the extra weight went into the bumper bar.
Just my opinion. Good catch on the different thickness bars.
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Jason Rackawack
1975 455 Trans Am - 1975 Firebird 400
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