A pair of small air cleaners that will fit a 4bbl carb.
At 1/24 scale they equal 7.5" diameter
At 1/25 scale they equal 7.8" diameter.
It consists of a semi-coned aluminum top and flat aluminum bottom, with screen material in between.
Here is an example by Michael DeSorbo.
Two complete air cleaners, by Parts by Parks, 1/24-1/25 scale.