This happened to my 09 328ix coupe a couple of months ago. My elderly father got into the passenger side seat, reached for the belt, and actually produced the plastic extender and asked, "what the heck is this thing?" Instead of grabbing the belt he yanked the extender out of the motor mount. Took it back to the dealer and they had to order special parts to fix it and the motor. Took about a month to get the parts but now everything works fine.
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