See this thread on wheel cover attachment.
http://ecomodder.com/forum/showthrea...orn-14306.html
I'm assuming you have some alloy wheels on the car and probably some nice newish lug nuts. So for this attachment method you might want to get some other closed-top lug nuts to modify. Cheap from a junkyard maybe, or from a parts store for $25-30 if I recall.