I don't know your specific light fixture, but if you can figure how to disassemble it enough to change the bulb, you are about 90% done. Once you get the bulb out of its socket, see if you can see a small part number printed on it. Type that part number plus the character "A" (for amber) into an internet search, and you will probably find your bulb.
If that doesn't work you may have to use this stuff:
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