Center caps for passat wagon 118 tsi

[Purenv]

Any idea what size the center cap should be for a 2011 passat wagon with standard 17" wheels. They appear to be cheap on ebay however there are to 2 common sizes 50mm and 60mm. When i measure my car the Inside diameter is 50mm and diameter of actual center cap is 60mm on the outside. Any help would be appreciated.

Thanks