Finally found some 12 Volt headlight bulbs (halogen) for the Graham. I located them at a business in Australia "Classic and Vintage Bulbs" http://www.classicandvintagebulbs.com/
The owner Anthony Pearson was actually visiting the Hershey Swap Meet when I contacted him by e-mail and shipped them to me from there. Great guy to deal with and I highly recommend them for any headlight or bulb issues you may have.