I understand that the genuine BMW M performance caps require removing the glass to screw the cap to the mirror housing. The non genuine ones clip in like the the standard caps though.
I have some cheap ones on mine and one is starting to de-laminate.
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2014 M235i / EB-II / Coral / Sunroof / Comfort & Parking Packages
2014 X3 3.0d / M sport / AW / Sunroof
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