Some RFA's Club members are using these and really like them. My understanding is they got them at a show, not sure how it would be dealing direct with the company. I don't believe this company has any US distributors. First link is home page, second is direct to Model A LED Headlight
http://www.classicandvintagebulbs.com/
http://www.classicandvintagebulbs.com/page6.html