I have some Quartz halogen direct fit refocus base bulbs for my 36 from classic and vintage bulbs, -- there may be other ones , I have seen some made in India but they didn't have consistently positioned filaments, Anthony sets up at Xhershey to sell his bulbs, he also had a sample of a Led headlight bulb sold in England and while it was nicely made it didn't focus well or project a useful beam of light, perhaps if a reflector was designed for it
I have been using Anthony's bulbs in my A for 15 years, brighter than seal beam, fine with the generator (uses less electric than a seal beam, or a 50cp bulb, and so far none of his bulbs have burned out, perhaps because I bought spares too