I asked Mazda USA about that too. They say they still maintain a parts inventory for all "Mazda Manufactured" parts. The lips and wings were engineered and manufactured through an agreement with a 3rd party subcontractor and therefore not Mazda Manufactured parts... The rumor is that the "3rd party" was Wings West, and that they and Mazda had a falling out; therefore no more will be made.
weird because when I crashed my car the body shop got the lip straight from mazda with no problems