what's the name of this part?

[Mdnewbie]

I have a 04 Tahoe Z71 and need to replace the grey plastic molding that holds both fog lights...

It snaps on the under the front bumper

Does anyone know what this part is called?

 

[Thorschariot]

Front air dam.

 

[jdasch515]

basically the bumper is made up of three pieces, the top plastic part, the metal bumper and then the bottom piece which houses the fog lights is also referred to as the lower valance.