[TurboKraft]

Carl,
Got your PM asking the same as above.
The reproduction Andial/Garretson IC shrouds that install within the rear wing are $138 + S&H.
No, you do not have to modify or remove the air filter housing.
Close up the holes in your engine's sheet metal, and cap the old heater ducts on the engine and chassis. Doubtful you'll find large rubber seals that will fill the old heater duct holes or will last in the het. Foam?!? Thin sheet metal is easily cut with tin snips, paint black and secure to the engine's tins.