I think I may still have the adaptor to convert your headlights, you are welcome to them (if I can find them) for postage only. But you will be un-impressed.
First, try to find 6v sealed beams, you may find them at some motorcycle shops, or tractor shops, and they are harder to find. I think the regular bulbs are equal to the sealed beam bulb.
Second, they just look horrible. Not to be picky, I'm far from a fine point person, but that classic look is gone.
I bought Halogen bulbs from Hirsch supply. These do not require any modification, take your old bulb out, this plugs right in.
WARNING You CANNOT touch the bulb in any way. The oil in your fingers will cause damage to the coating of the bulb. They come packed in a foam holder to handle them. You have to save these holders, in case you want to remove the bulb.
They are not cheap at about $40/ bulb. I am going to be honest, the first set I had; I put them in and I took a test drive. The first bulb blew in the driveway, the next went about 3 minutes later. I was upset and called them. They were very nice to deal with and they sent me a replacement set ASAP. I have now used them for 3 years. They are about 40-50% brighter.
They also sent a follow-up email with an apology, and to check on the results. That's service.
There are several different bulbs on the market, but look close, most require you to alter the socket and reflector, and make changes to the setup, so if you have a problem you cannot just unplug the bad light and put in my old bulbs in my toolbox.
You have to order the correct bulb for your car, either 6 or 12 volts, and generator or alternator.
I do not have any extra draw on the new bulbs. They carry headlights, tail / brake lights that are very bright also. I have converted almost all the bulbs in the car. I did get a set for my cowl lights, but they were just too bright.
The company to deal is with Hirsch Automotive 396 Littelton Ave, Newark N.J. 07103 or
www.hirschauto.com 800-8282061. Chances are if you order Halogen bulbs from a catalog, you will get Hirsch bulbs, there are advantages to dealing directly with the manufacturer.
I really like mine.
Craig