You have some options then.
The go-wing style spolier came out about mid-1970 model year.
The deck lid with provisions for that spoiler, the AAR spoiler and the luggage rack came out about March of 1970.
The same decklid with cutouts for all three options was used for 1971 on Barracuda models. They are also available new as reproductions I believe?
I found a replacement decklid for my T/A on a 1971 318 Challenger.