Fender Jack Bracket - Where to get new retention nut?

[blindbug]

Does anyone know of a source to get the round retention slip nut for the Fender Jack Bracket Hold Down? I'm talking about the round nut that is in the MIDDLE of the bolt in the attached pic. This is the nut that snugs the bolt up to the fender so that it stays put when you take the wingnut off to remove the Jack / lug wrench, etc.

What in heaven are these things called (Flat Round Speed Nut?), and where in the world do I get one that isn't twisted and kinked up?

Thanks in advance for any help you can provide!