Plastic type material looks like a filler plug . Has a boss on far side with a slot cut in it. I figured it would be to plug a body hole, but I can't find a slot of that size.
My bed is naked complete with scars.
I'd love to get a spray in liner rhino and xliner I think are within and hours drive max from my location.
The bed mat I had in my Taco helped keep shit in place as that bed was plastic and slick as goose shit.