I have good news and I have bad news. I found out another place where a plug like that is located. But it is in the drivers side rear wheel house at the back. The bad news is it's hidden by the plastic wheel liner. That would have to come out to see if it's there. I would have it checked as it's at the lower part of the body and if you would go through a lot of standing water, you could get some standing water inside the body. This hole is only on the driver side.
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