The pictures of his car that I found are from a post from 2007, and I believe his Car domain says that he sold the car years ago. Plus, it doesn't appear to be active.Nothing that I know of like that being manufactured specifically for the sport bumper. It could be custom why do you send him a message on his car domain and ask?
We are basically looking for an aftermarket part that fit a 2004 Mazda6 with the sport bumper (given the same front end body style ranged from 2003-2008 - dependent on the type of sport front end.) I know for fact that his bumper is the 'North American Sport Bumper' because it is the same as mine. My year is a 2005.
To answer your question, there is probably no one to contact because the person doesn't have the car anymore :-/