Based on the '51-'56 Olds/Cadillac air cleaner
Full 18 1/4" wide, not a scaled down version, uses over the counter 14" x 4" replacement elements
includes all steel housing, steel top, paper filter element/ carb stud, and unique rocket shaped wingnut
5 1/8" carb neck only
Notched at rear for HEI distributor clearance