Wallace,
I think your dealing with a cage nut. You would not be able to find it to put a wrench on it as it is located inside the rocker panel. You will probably have to force the assembly out somehow, maybe using a pry bar, then you would be able to get a wrench or pliers on the cage nut to remove it. New ones should be available from the dealer.
Does the one that "spins" look like item 8 in the picture?
Regards,
280SE Guy