I bought a set of Audi RS4 reps wheels and it came with Audi caps. The shop could not find a VW cap and ended gaving me VW decals to stick over the Audi. Pretty crappy.
The original 07 Passat covers are a tad wider and does not lock in because it is not deep enough.

I think the diameter for the centre hole is around 55-58mm. Does anyone have a VW caps on the Audi rep wheels. Do you know what size are they and which OR caps will fit them? Alternatively, where can I buy them?