just seen these on ebay

Hmmmm, if they're 17" they're not "Genuine Audi RSTT Alloys". They're the ones they put on A2s etc.
 
a3.jpg
 
Hadn't realised they were factory fitment to some A3s. The A2 I was loaned by Guildford Audi had the same 17" wheels, albeit with rubber-band like low-profile tyres.