What "makes" a 66 Barracuda a Formula S ??

cudamark said

Any of them with the 14 X 5.5" wheels came with the cut out on the trunk divider panel.

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My 1966 Form S did not come with either trunk cut outs.....but hey who knows why....and pretty sure my 1965 Form S I bought in 1975 did not as well or I would have those parts in stock still.