Air intake help

Well I just recently purchased a used car, I have a general knowledge of cars, so I looked under the hood with friend who knew what he was doing. The only thing that was missing was the air intake hose, I figured no big deal, quick fix... Well apparently there was a reason the dealer didnt do it himself. Its almost impossible to find the one I need, I visited 5 places with no luck... Going to a pick a part junk yard tomorrow to see if I can find it...

anyway, just wondering if anyone knew where I could find what I need...

one side of the hose is a 3 inch circle...
the other is a 4 by 2 inch (if I remember right...) rectangle...

just need a real short hose...
as a result my car heats up VERY easily, and i cant stop and leave in running while parked... anyway, any help is appreciated...

the stores I visited myself where -
-Autozone
-Pepboys
-Car Quest
-Nevada House of hose
-Napa auto parts...

none seemed to have one...

it would help to know what car and year and engine and such......

But i can tell you that part is a dealer part most likely.
Keep searchin the salvage yards and you might try Ebay.

Good Hunting!