Go Wing or No wing on a 72 Demon 340

1970 Go wing
early 1971 Go wing
late 1971 gull wing
very early 1972 ribbed deck lid with spoiler cutouts gull wing
most 1972's no wing.

I have never seen a 1972 with a factory wing. I have seen the deck lids with cut outs that were ribbed but no wings and only 2 in all my years of stripping and buying these cars.