I'm sure the wheels are designed to be mounted hub centric with the appropriate ring, the problem is finding out the info that you need. You need to know the size of your hub to the nearest millimeter and the hub size that the wheel is designed for. Places like tirerack usually include the rings for free if they have the car specs. I did a search and couldn't find sizing info for either.
edit:
Here's a place you can order them from if you find out the size information.
Link: Just for Wheels - Hub Centric Rings
Nevermind, they only do US Mail shipping and they are in Miami so there is no guarantee that you would get them overnight.