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Well , that's why I have "parts trucks" I rarely if ever use store bought fasteners when putting one of these back together in "original" form. I Reuse many original nuts and bolts with the correct head markings and size and simply clean and replate them. Makes a BIG difference when you see any restoration done. My biggest turn off is seeing a restoration and every nut and bolt was bought at the local hardware store , all of your local hardware is now Chinese and is NOT the same thread pitch or diameter most the time. Theres a company that actually makes most of these fasteners exact. Pretty big catalog selection right down the the head markings and GM part numbers if you needed something speciphic. I will try to get that info and post it later. If you're doing a restoration , its worth it , resto mod or modified , who cares.