Here you go. First picture is the Direct Connection Spoiler. The second is probably the best known Duster with on in it, the car is called DustAAR. The third is a mock up of one someone started for the Darts, but you get the idea.
Going to put something like that on my 64 Dart G.T. Stock is boring to me but to each his own.I won't knock someones car if they don't put one on and would like to think they wouldn't knock mine with one on it.