What are these called, fender splash shields?

[sigshooter]

These go on the top edge of the front fender, under the corner cowl of the cab. I am guessing they were added by GM to help keep dirt and mud from splashing on up into the cowl area and on into the door jamb..... My guess. Does anyone know what they are called for sure and some of them had adhesive on the bottom where a rubber weatherstrip might have been attached, some don't.

someone who knows about these please educate me with all the info you have about them. Not all trucks I have torn down have had these only a small percentage so I am thinking they were added after the vehicle was built, like a recall or something. Once again someone help me out here