[randy500]

Originally Posted by 71CHEVYSHORTBED402

Still not useful?

Do you mean belleville washer, such as this fit? https://www.fastenal.com/products/details/0172467

That picture looks similar to the original part, but something doesn't look right.

I also believe the correct part might be the same as the washer under the screw on 69-71 door panels with the vinyl covers. Those washers are under the screw which is 1/4 machine screw with an oval Philips head.