There were any number of units a dealer was able to use. If not factory system, believe large Packards mostly used the ARA setup and also the Mark IV units by Mitchell Automotive Air.
NOVI was a fairly large aftermarket and custom builder. Some of their units have been found aftermarket in Packards. Apparently Studebaker used those units as factory supplied -- although there does not appear to be a label on them in the 56 Stude manual. In 57, since Packard was a Studebaker, that was apparently the factory unit of choice. The dealers were free to use them as well in prior cars.
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