What PARTS did Hurst and Chrysler put in the Super Stock Barracuda & Dart not in other factory cars

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hemicop said
Weren't the wheels on the Darts, as shipped, have some sort of weird offset/part number? I vaguely recall something about early Dakota wheels being the same or similar.
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The rear wheels were a 15” with a positive 1.250 added offset. Here is picture of my repop wheel.