They are indeed a 15x7 Ronal R8 which was on the accessories list from the main dealers when new. There's also a deeper dished version which was never available through Audi. I would show you a photo but it's all locked nicely away for safe keeping by photobucket.
edit - here you go, Car on right OEM assessories catalogue 15x7 R8 - Car on left after-market Ronal catalogue 15x7 R8. HTH.
