I forgot to mention that the lens is the other important component of the headlight system. For my 1937 truck it needs to be a "Tiltray" lens. You can't just use any lens of the same dimension, it needs to be matched to the reflector. Do your research. I have enjoyed restoring these headlights and learning but if you want a daily driver I would go with sealed beam.
Kent

1937 Chevy 1/2 ton
1942 Chevy 1/2 ton
1947 Diamond T Model 509
1951 Chevy 1/2 ton
1950 Chevy COE Model 5700 ~ "Barney" ~ And more pix