Looking for a lead to find piece for gas cap 1971

[MikeL]

Thanks for the reply, It's along story but after checking the auto zone, lowes, Ace hardware and Harbor Freight, I came home defeated only to look on...

[MikeL]

I'm looking to see if anyone has or knows where I can find a good used parts source (Junk Yard) that might have this piece I need for my 1971 U.S. Gas...