The gull wing was a 70 only part, the go wing was 71+, and the DC spoiler looks like a duck tail. Do a search for the car called DustAAR and you'll see the DC spoiler (on a side note these spoilers are functional).
You can get/find the fiberglass ones on eBay or through whoever makes them (I think it is mas, but not sure on that) but the original ones are a little hard to find and made of abs plastic