In the newer issue of CarCraft they tested airfilters andshowed a picture of a car with a plastic airbox attached to the bottom of the hood with a hold for the air cleaner to fit in.

Does anyone know where these can be bought? I want my SS hood to have functional cowl induction but did not want to use the factory door option

I had the flat piece cut from the tunnel so that air can flow already but will only work as intended if the hood is sealed to the air cleaner