The "fogs" on an RS equipped car are actually daytime running lights and use the P13W bulb. You can however buy a harness/adapter so you have actual control over them.
Here is a replacement bulb that is very close to the HID's, color wise anyways.
http://www.automotivelightstore.com/P13W.aspx
Here is a harness/adapter, a 4th group buy will start soon I'd imagine.
http://www.camaro5.com/forums/showthread.php?t=74747