I don't know for sure, but it's possible the bolt is longer for the M cars in order to clear the fang on the bumper. Non-M cars could have a shorter bolt to mount the plate closer to the bumper.
Just a guess since I'm pretty sure the thread size/pitch is the same.
Quote:
Originally Posted by midn12ght
not really sure. but the website made a point to refer M owners to a different drop down. anyone care to chime in?
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