Ahhh...I remember an old TV series, The Prisoner: "I am not a number, I am a free man!"
Patrick McGoohan as "Number Six". A strange, excellent series of only 17 episode. (I have it in BluRay).
The nut fastener used with this is the same that attaches to the seat track studs that go through the floor.
Another hardware part with a name, 378643-S2 (Nut and washer assembly)
But the left hand side uses a nut clip, 379831-S2 and a fender bolt, 378156-S2 to attach the stone deflector.
Pop quiz: Why does the right side use a "Screw and retainer" on the radiator support, and the left side uses a "Nut and Retainer"?
Charles and Jeff are excluded from the quiz.
Jim