May I respectfully ask why the drain plug fell out? You said you did the oil change yourself. Do you use a use a torque wrench to install the plug? Have you checked to determine whether the existing threads are stripped? I would check to see the condition the threads before ordering a new drain lug of any kind. If they are stripped, then you will be required to go to an oversized drain plug. If so, there are self-tapping drain plugs, but there are tricks to installing these.
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