A few months ago, in another thread on this type of air cleaner, I posted a link that may bear repeating, here.
The
BATWING AIR CLEANER GUIDE is PDF file that I found online. Put together by a Pontiac V8 enthusiast, it shows the non-Packard applications and variations, as well as some "wannabees" that are mistakenly called "batwing" air cleaners. It also has dimensions, but none for the 55-56 Packard applications.
While I've seen some genuine batwing units on 55-56 Caribbeans that were chrome-plated, that finish is not (and should not be) considered as "factory authentic".
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