There is a fellow who put together a relatively decent treatise on some of the various batwing incarnations as to what fits what in the GM and Chrysler world. As it was put together some 50 years after the demise, Packard was not mentioned -- or maybe he is one of the young people that never knew Packard ever existed.https://www.pontiacsafari.com/L1EarlyV8Pontiacs/56DualQuad/BatwingAircleanerGuide.pdf
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