I work at an insurance driven bodyshop. Fully 1/3 of the aftermarket parts we recieve get returned. Nissan factory parts are almost as bad. BMW and MB aren't really supported by the aftermarket. We only see OEM for those 2 brands. Used parts are also commonly used, but again not for BMW/MB. The best way to guarantee OEM parts is to take your car to a BMW certified collision/refinish center for any claim. They will get your insurance to pay for OEM parts.
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