Those idiotic covers are the laughing stock on practically every car forum on the internet. Either you're joking or you need to give your head a shake. You don't put plastic covers over your calipers unless you want everyone to point and laugh.

As Redline said, paint them. Proper caliper paint is far cheaper than stupid covers. So many car enthusiasts wish they had brakes as big as the x5 and you want to cover it with rice-boy wear. Don't destroy them with ebay junk!