Replace plastic on rear bumper (2010)
 

2010 Mazda 3 2.0L

Someone dented the plastic part of my rear bumper unbeknownst to me. Am I able to buy just that plastic piece or do I have to replace the whole bumper? What is the plastic bit called anyways? (Circled in red below)

http://img30.imageshack.us/img30/2201/bumperz.jpg

whole bumper has to be replaced, the black section is molded in, sorry