Thanks, I already used #8 phillips screws that were 3/4 inches long. By the way, I cleaned my old visors and painted them with vinyl paint and they look brand new.
Mine are all stainless too. For the doors and other places that used flatheads, I bought conical washers that center the bolt in the hole and they all worked out fine. And the hex heads make the Jeep look more rugged >)