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

a lot of the parts on these cars were off-the-shelf items for a variety of things---- A100 (van) seats, these delete plates, the de-clutching unit for the fan, to name a few. So if one is careful enough, have the part numbers and is patient, one can find these "specialized" parts pretty easily.