I have a 2003 Mustang that I bought a new cowl vent for but it didn't come with the 6 metal retainer clips. I searched and found an older post on this very subject but its closed: Cowl vent grille metal clips
Local auto parts stores don't have them. I've found them at two different wholesale places online (Kimball Midwest and W&E Sales) but they only sell to businesses. Maybe I need to make up my own business name.