I've been searching the forums but can't find a related article..

The weather guard in the wheel well of my front passenger side became loose and has over time (unknowingly by me) been ground down on a portion of it.. The rivets that are still in hold it from being ground down any more so here's my questions

Is this piece important? I understand it may decrease my aerodynamics and make a little wind-noise at high speeds but does it serve any purpose?

What is this piece called? so i can find it.. I worked at a body shop and we always referred to it as weather guard but I can't find the part online...

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