Wheel Nuts!!!!!!!!!!!

Hi a little bit weird I know but can anyone tell me the head size of the wheel nuts on the 2008 197? Why? well all down to my OCD.......wheels are being painted as we speak and my car is at the shop to, but I want to purchase wheel nut covers (both white and black ones as I'm not to sure which route to go down....but that's another possible thread) but when trying to buy them they are coming up with different sizes? I think I need 17mm but not 100% sure Any Idea's...................thanks in advance

PS* Only a couple of £ put I am a Jock and I don't want to be wasting my pennies
 

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