does your bulb look like the amber bulb in the attached pic? It's the rear bulb from my People S200 (and coincidentally the exact same rear bulb my Ninja 300 uses).
it's a BAU15S amber bulb, also referred to as a PY21W. If this looks like your bulb do a search and you should find a replacement. The pins on the base are at 120 degrees (my front bulb was different, bigger clear bulb, a BAU15 with pins at 180 degrees)