ok, so i got a set of center wheel cap covers a few weeks ago, and the person who i bought them from sent the only 2 metal clips for them that he had. everywhere i call have no idea what these clips are, and they say, "the clips are on the caps"

anyways, does anyone have them on with just the plastic tabs that are on the caps? i slapped one on like that, and was in somewhat snug, but not too confident about them flying off.