I did some more digging around and ran across this place
http://www.taillightking.com/Headlight_bulbs.htm cut and paste that sucker in your browser if it doesnt show as a link...theres 6v high/low beam bulbs on there plus other bulb goodies. The old willy's jeeps were 6v as well come to think of it. I guess it varies by state but I think here in N.C. if you have a antique/vintage you get to by pass the inspections ordeal.