Stealhwolf is right - VW have never been forthcoming with the paint code.
I always found the original finish to be pretty dull. Poor on VW's behalf.
As a birthday treat last year i had my alloys refurbished, and they were close to the colour that VW refurbished the faces in when i bought the car. The colour was BMW Ferric grey!!
It's a nice shade and I've been very happy with it