I converted mine to use the dual filament bulb about 30 years ago and added turn signals. I found if I painted the inside of the light housing a bright white the light seemed more visible than if it was painted silver...particularly at night. I've looked for led replacement bulbs, but I haven't seen any that put out more light than the old type.

~ Jon
1952 1/2 ton with 1959 235 | T5 with 3.07 rear end