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5/16 x 3/4 long looks like it will do for most everything . Iam currently taking my front end appart and I plan to use unlike stainless steel fasteners to assemble the body work .
Some guys have used these kits with good success, BUT these are aimed more at what is needed for a complete re-assembly on a complete restoration. You might give them a call and see if they have smaller more focused (and cheaper) kits for front sheet metal, etc.