'73+ Big bumpers- any attempts to change the look?

Somewhere on here one of the members posted a picture of his dart/scamp (don't remember which or the year around '73) with a small air dam under the bumper that looks absolutely awesome. I remember it was a stock dam from something else, just can't remember what. I hope this post gets his attention because I would love to get the details and do the same thing to my '73.