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Hi,
Plastic? Mine are Stainless Steel - OEM PN# 930.351.919.00. Maybe that explains the difference in size.
I suggest pulling one and taking it to the Dealer to compare with a SS one. If the Pitch and thread size match, switch to the 11mm Stainless ones so you don't have this issue over and over...
Happy Motoring!... Jim'99
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