The first place I'd check is the specialty-screw drawers at your local hardware store (not the "big box" stores). Hey, mine's got restoration-correct Pistol Grip handle screws for 12 cents each, so chances are good you'll find something very close if not exact. If not, find your local Au-Ve-Co dealer and ask to look at "the big book"--the one that's almost 3" thick. Probably 99.9% of restoration hardware kits are sourced right from that catalog.