i have found several different bars over the years. in 73 there were 2 bars, both long but thinner bars on the formulas and firebirds. same for the 74-76 with bars. the Trans Am's had thicker bars with the formula's having thinner ones. even then i think the 75 was thinner than the 74?? it has been awhile since i looked at a set side by side. i know the 73-74 were thicker as the plastic air duct piece had a wider bracket to fit it.
just a guess, but i think the formula's ordered with the TA suspenion probably got the thicker bars??
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