If its the part that I'm thinking of, it looks like you can
source that part for $80.59 plus shipping (see item #11). However, its it not visible from the front or the damage is interfering with something, why not just leave it alone?
[Edit]: If you are talking about the
plastic undercover (item 18), looks like that is running around $221 and change. At any rate, hopefully these links will help you find what you need.