The plastic protective cover under the front bumper

We have a 2008 Prius. Shimpy decided to remove a part on a curb stop. It's the black plastic protective cover that bolts on underneith the car right behind the front bumper. It's right behind the air intake and I think it's important for directing air towards the radiator ... probably ...

I've searched the internet for a part number or a parts diagram, with no luck, but that's probably because I don't know what it's called. Any suggestions on where to look? Thanks.

 

Yes, that's it. Thank you very much!