Item 12 is just a 3/8 24 thread bolt.
No, it is not. It is an AN316-6R nut. Do not buy a nut at your local hardware store.
Copy that. A new AN316-6R nut is only $0.15 each from Aircraft Spruce.
I MAY have a set or two out in the hangar that I have no need for. I will check tomorrow morning....
Awesome. Let me know what you find and thank you very much for looking. It's mainly the clevis that I need.