This is a 7" diameter air cleaner assembly designed for use with a Holley 94 two barrel carburetor. Top lid has been made using a 1935 Ford stainless steel hub cap, inside rim ground off, and flat mounting surface created using Bondo body filler. Bottom lid (base) was the magic. Ordered a 7" diameter aluminum disc, cut round hole in center. Ordered a black plastic adapter for 4 barrel to 2 barrel, epoxied it onto aluminum disc, filled-in gap between outside edge of plastic piece and aluminum piece with bondo body filler, sanded smooth (see last 2 photos above), then attached the metal adapter clamp (2 part epoxy, J.B. Weld) that will lock air cleaner onto the Holley 94 carburetor. Sooooo, 1 hour's work on top lid, 3-4 hour's work on bottom lid. Air filter element is a NEW $$$ 7" by 4" tall K&N washable filter, not pre-oiled by K&N as normal, so buyer should obtain a can of automatic transmission fluid, puncture with nail hole, then let slowly drip onto filter element- - -do not over-oil. Note, center threaded stud was shortened since photos were taken- - -easy deal.