DS3 wheel nut cover size?

[Ohmygoditsme]

I own a 2012 DS3.

I have just noticed I have two missing wheel nut covers on the car.

Can anyone please tell me what the wheel nut cover size is? 19mm or 17mm seem to be the most common but I don’t know which is the correct size.

[Ohmygoditsme]

Just an update in case anyone wonders in future. I took the plunge and just ordered 17mm ones.

17mm fit perfectly.