source for 6v LED screw in bulbs?

I have a bullet style headlight that I installed a 6v bulb in and modified to run on 4 AA batteries. It works, but its not bright enough. I want to convert it to an LED bulb, but cant find any 6v screw in LED bulbs. Any help?

that light is perfect - except its ten bucks. I have seen other bulbs for that price, and I am not paying it. I will rig up a maglite before i pay ten bucks for a single bulb. have seen led bulbs for model trains on ebay for real cheap - four bulbs for $2 and free shipping. problem is they are in china. have ordered stuff from china before and not received it. so thats out of the question. but it did give me the idea to check hobby shops. gonna go to the local toy train shop in the morning and see what they have.

I took a bulb out of a mini maglite. soldered a few wires and it works like a charm.