6 volt minature bulbs availability

[Rob CLC 12428]

I am looking for a 6 volt screw base bulb of low wattage. Somethig that would be found in an instrument light. I have hunted with no success (auto parts stores domestic & foreign, hardware stores,  motorcycle shops, & bike shops). It is to replace the burned-out tail light on my bicycle. It is a 6v.generator powered Schwinn light system still sold at Target stores. I love the system but am frustrated by the inability to find a replacement bulb. I can find a higher wattage bulb similar to the one found in the headlight of the system. It causes too much draw on the system and causes the headlight to produce about half its candle power. Im assuming bulbs like this may have been used on some older Cadillacs or similar 6v. vehicles. Does anyone know of a source for these bulbs?

[baxter culver #17184]

try http://www.bulbman.com TARGET=_blank>www.bulbman.com  they seem to have everything.