Vintage Mr Gasket air filter assembly from 1985! Part number 1488. For  Weber and some Holley 2 Barrel carburetors.  The last picture is of the instruction sheet  and it shows applications that this air cleaner fits.

I also found some applications it will fit; listed below.  Most important thing for You to check on Your application is the air cleaner base, it has a specific  " diamond shape " (not round)  and it mounts to carb with bolts.  This kit has mounting hardware. - HOWEVER  only one 1/4 inch bolt with lock nut is included. (others went missing years ago) So you may need 1 or 3 more bolts , or use your originals.  See actual pics of hardware that is included . It does include 2 base to air cleaner Gaskets. The air filter element is slightly yellowed in color ,  manufactured in 1985! That will not effect  as new performance. The replaced Mr Gasket filter element number is 1487a and is easily found on line or cross reference for a common 9x2 filter at your local parts house. The Chrome air cleaner lid does have some Very Light scuffs or scratches that may polish out. All I did was wipe dust off with a cloth and glass cleaner for pics. The Original box shows wear, of course, and pic shows date of 1985.

Some applications : Models with Holley and Weber 2 Barrel Carburetor with Diamond style Carburetor top.

-1971 thru 1977 Chevrolet Vega and Monza with 2.3 and 140 , 4 cylinder engine.

-1974 Ford Mustang ii with 2.8  4 cylinder  . also Mercury Capri

-1974 thru 1977 Ford Mustang ii with 2.3  4 cylinder.

-1971 thru  1977  Ford Pinto with 2.0 and 2.3 4 cylinder.

Can replace that homely rectangular cheap Weber air cleaner!

Very Rare! I have not found one for sale, or even another picture of one on the internet.