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I am having a hard time finding exactly what light bulb I will need. Do you, or anyone else, have a part number that might help me out?

I have a 1970 CT-175. The thing runs great and iI have it all dialed in, except one problem. The front headlight is burned out and I am having a terrible time trying to find a bulb for it. The bulb tha tis burned out is made by Kioto, but I can't find anything by searching that. I would love any help or ideas as to how to get this thing working. Thanks, Andy