My friend ordered what seems to be legit RAYS centercaps from this seller on eBay. Seems they ship from Japan. Really good deal considering they're usually $30-40 a piece. I've seen them in person on his and it looks legit to me. I was gonna order a set, but they don't match my bronze 57xtremes. They should fit the 57DR's as well
red
http://www.ebay.com/itm/NEW-4X-VOLK-...item280379c1be
blue
http://www.ebay.com/itm/NEW-4X-VOLK-...item2a53fc0103
black
http://www.ebay.com/itm/NEW-4X-VOLK-...item2a53daaa14