The black piece of plastic that sits in the lower part of the bumper on my 2006 V6 mustang fell out at some point. Could someone tell me what this piece is called and where I can order it if I want to try to put it back in myself? Thanks in advance.

 

Thingie...lol. Do you mean the lower grille or one of the small fog light covers?

You can buy pretty much any oem part here-

http://www.fordoemparts.net/