Mirrors Help

[indiemike]

Im looking to buy some chrome mirror caps for my S3, just need some help, when i bought the car the lad said it has got some of the facelift parts, im not to sure if this includes the mirrors. It is a (W reg)

Is there a way of finding out? Part numbers etc...

Sorry if this sounds a daft question, i just dont wanna buy the wrong mirror housings