I got a new flex cover for my front bumper. Many years ago my former wife ran the nose of my car over a parking bumper at McDonald's. Since the bumper cover is off, I am going to replace the lower shroud/spoiler and the spoiler extension. I need rivets to do that in several locations. Several vendors show black or silver soft aluminum rivets that are to be hammered in place. I have black-coated pop rivets as installed from the factory. The part number - 3942604 - is not found by my local parts source. Can you guys help?