The chrome base can fit to 2 5/8" Strombergs or Holley / Edelbrock 94's and then there is a reducing insert included that allows the air cleaner to fit to carbs with a 2 5/16" neck.
4 1/2" Diameter, total height is 4" with 4" Diameter Paper Elements. Held together with a Polished Stainless Steel Acorn Nut.
Listing is for 3 Air Cleaners.