Accelerator pedal question - 65 Barracuda v8

I believe it to be a "wear pad"...just something to reduce friction.
It should have come with that, but you could silicone glue a 1/8" thick piece of Nylon or Delrin there

I had bought a couple of these, to replace the one on my "66"...none were like the factory pedal.
On mine: the hinge broke.
I finally found a hardware-store hinge and adapted it to my original, job done