I have a Mint Blue duck tail spoiler for sale. From what I know, it's authentic. I've mounted it onto my own car before just to test fit, but never actually used it. The fitment is absolutely perfect (lines up with factory and 3rd brake light). I don't have pics of it right now, but looks like this. I'm gonna ask $250 to take it away, but shoot me an offer if you're interested.
https://www.flickr.com/photos/inghos...n/photostream/
**JUST TO CLARIFY: "Mint Blue" is the company that makes spoiler(jdm), not the colour.