To Restore or Not Hardware

de rust with evaporust,wire wheel or blast.
..for bare metal that is too shiny heat with a propane torch and quench at the color you want.
Any thing bare is coated with RPM or paint with the appropriate color spray bomb.
i think you can get a close cosmoline match by experimenting ...warm a wax seal and diesel oil
or try different shades of gold and satin clear coat if you're fussy