Just thought I'd share, as I really like the result. Finally broke down and purchased one of those stock FC front chin spoilers from Ray Crowe at Malloy Mazda. My FC never had one, at least since I owned it. Anyway, the piece came prepainted in stock Brilliant Black, to match my car, and even included a handy instruction sheet that makes installation idiot proof. Apparently these came as a dealer installed option back in the day. It's made of a flexible ureathane (just like the FC bumpers), so it should be reasonably tolerant of the an occasional scrape and won't shatter like a fiberglass or CF piece might. Here's a picture of the completed install and the instruction sheet:
Installation was super easy, the only catch was that you need to reuse the existing bolts and U-clip nuts, and you might find that some are rusted beyond further use. No big deal, I was able to find what I needed at the local Pep Boys & Lowes to replace the few trashed ones I had.