I just ordered a pair from Kanter Auto Supply @ 1-800-526-1096, or kanter.com on page 68. Lots of places have lights, but few have ones that look like they are from the correct period. These are 6 volt and come in 5, or 6 inch amber or clear. Take a look and see what you think.
Thanks Gary, I did check it out, nice lights. But I would like to get a pair with flat lenses that will match my headlights which I think was all that was available in 1930. I might not be able to find any though and then I will go to Kanter.