Help identifying part

[OnceAnEagle]

Trying to identify this and where it goes. Found the fastener? on the garage floor under the truck about 1/3 up from the right front. Was not there the day before. It is black plastic, 1.5" across with a flat screwdriver slot on top, the stem is 3/4" long. It has "TRW" molded on it, along with PA66 and the number 8. Looked underneath for anything hanging and nothing. The truck has been Line-X undercoated so maybe something to do with that? Thanks.

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[RedTXV]

Looks somewhat similar to a typical push/screw rivet pin. Nothing comes to mind right off the bat to look at since you’ve looked at your under carriage.

 

[OnceAnEagle]

Then it could be off the wheel well when I had mud flaps installed. The factory rivets would have been removed during the install and maybe this is one of them. I'll look. Thanks.

 

[KartRacer25]

Looks like the floor mat driver side forward on mine came off a few times.

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