I have searched everywhere and cannot find a bulb for my vintage Bosch driving lamps. It looks similar to a single post taillight bulb but is nearl 3/4" in diameter as compared to 1/2" for a standard automotive bulb. I have attatched a photo of the bulb holder next to a standard 1157 bulb to illustrate the diff. Can anyone tell me where to find a single filliment 35w bulb that will fit? Thanks in advance