Wow! those wheels are pretty nice too, a chrome center cap would make them "pop". The manufacturer of those wheels Ultra Wheel Maverick Model: 234/235 also makes a similar model in all chrome with chrome center cap, you should be able to buy them separately for around $25-30 each or leave them alone, they do look great the way they are just thinking out loud
Ya the center is plastic, I imagine a rock will get them sooner or later, a chrome set will go on if and when they do get busted, my other set are the original ones that were on it, just painted them black, they will be my winter wheels!! Paid $802 taxes in for the Mavericks, wanted the XD series but didn't have them in 16's.