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A sheet metal shop (HVAC ductwork) can make one surprisingly cheap if you don't care for authenticity. Just need to measure carefully. To them, a shroud is very similar to a rectangular-to-round transition piece. They make them all the time.
That appears to be for a 6-cyl, note the single hump at the bottom. This is a V8 shroud, which does have much more of a 3D aspect to it (being a shorter engine, further from the radiator). Sorry, no pics from the rear showing the double humps.