A salvage yard was going to be by suggestion. You don't need 100% correct fasteners...just ones from a same era Mopar. If you can't find a local salvage yard with 70's iron, and you don't know of anyone that has bins of original fasteners(from years of parting out cars) then maybe post what pieces you're looking for. Maybe someone on here would ship you some. Going with new fasteners from a restoration supply house is probably going to be your most expensive route.