Guys, thanks for the advice. I didn't think about that area needed for airflow ... just figured the main grille area was adequate.
A friend with a GMC truck & factory fogs tore his loose while 4wheelin' and said his were pretty cheazily mounted plus being mounted low in the airdam.
Although I don't plan on doing the type of 4wheelin' that he does, I figured that since mine didn't come with fogs, I thought I'd take a hint from Dodge & Ford and mount 'em higher and surrounded by some bumper protection ... hence the thought of utilizing the area I circled (GMC grille/bumper area is different which is why I only have Chevy in subject line, but their application would be similar).
Guess I'll keep searchin' ... trying to avoid spending the <font size="4"> <font color="green"> $$$ </font> </font> for a grille guard just to mount lights on.
Bill