Slant 6 Air Cleaner

More specificity needed; there were two different common non-CAP '63-'67 Slant-6 air cleaners. The "large and flat" item is about 11" diameter and has a deeper drop to the base and takes a lower-profile air cleaner stud bail on the carburetor, and the "small and tall" item is about 8¾" diameter and has a shallower drop to the base and needs a higher-profile bail. The only parts-mixing possible is the large lid with the small base and its high-profile bail; that gives an unsilenced (loud) air cleaner.