need piece of cooling tin

I need the piece of cooling shrouding that fits vertically at the right rear of the engine of pretty much any mid-1970s 911, that ducts forced air to the hose that leads the air to the right-side heat exchanger. I'm mounting it on an '83 SC that currently has that area entirely blanked off. (I've removed the entire heater-blower rig from the engine, having switched from CIS to carburetors.) Anybody got one?

Stephan Wilkinson