I have a 1999 Toyota Avalon. I noticed the small plastic grille below my left headlight missing and there's a dangling plug inside. I can't figure out what used to be in there. The car still runs fine. Inside the passenger-side grille is a grey plastic box, probably connected to a similar plug.
What would an auto parts website call the flexible sheet of plastic bolted underneath the front corners of a car, just in front of the wheel well? It looks easy to replace, but I don't know how to go about getting a replacement.