So I just got me a 1970 motobecane mobylette (have changed it since this pic was taken by the previous owner with ape hangers and a super sick looking exhaust and it so now as a skid guard and a very nice seat that came with it in a box of parts...pics very soon) and I need to know what brand & size would be a suitable replacement bulb? She had none in when I got her it so i have no point of reference.