Looking for external bolts for 1970 A Body for mounting body panels

I'm facing the same situation, getting a project I bought from someone else up and running but some stuff is missing and I have no way to figure out what's there or not except the hard way. I solved a lot of the missing nut-and-bolt situation with a trip to the nearest pick-a-part junkyard. I filled a coffee can with nothing but nuts and bolts off other cars and it didn't even cost $10.