One of the drawbacks of these 21" wheels are the price, if you wanted to replace one. I had the misfortune of hiting a curb as I turned into a parking lot in California, hard enough to pop the tire. The tire took the brunt of the hit, but it also did some serious curb rash.
Long story short, after pricing these rims at Ford I found them to be very expensive to replace. At the tune or $1128.98 MSRP each! Anyway new, not remanufactured, rims will set you back north of $700 each.
From what I have found, these rims were painted either hyper gray or gunmetal gray. If you want to keep the original rims which came with the vehicle, then there are wheel remanufacturers that supposedly guarantee their work to match the color of the other three. They weld, CNC and then powder coat them before going to the oven. This service can be anywhere between $150 to $175. A very small price to pay for keeping the matched set which came with the vehicle.