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One other thing, for the price you could get a base model wheel, it might be worth it to see if the spoke covers would fit the IUP wheel. Looking at pics, they appear to be identical. Maybe stop by a Ford dealer for a closer look or if you know someone with a non-IUP wheel, see if they'll try a quick swap just to test the fit.
Yes, that's not a problem. Pry from the edges and they'll pop right off, you 'sneak' them from under the bag.
As far as painting, that works fine. I did mine in satin black. Just scuff the satin silver, prime, sand to your smoothness desired, paint, allow to cure, put 'em on.