part #90120-425-000 discontinued, alternatives?

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Hi guys, this looks like a collared nut that holds the  reflector on the headlight casing, and in turn holds the headlight to the frame. The part is discontinued but does anyone know where I can get a couple, or what to look for in the hardware store? thanks

(#22 [url=http://www.hdlparts.com/fiche_section_detail.asp?section=125756&category=Motorcycles&make=Honda&year=1979&fveh=2994]here[/url])

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sorry I was trying to type see part number 22 at this link:
http://www.hdlparts.com/fiche_section_detail.asp?section=125756&category=Motorcycles&make=Honda&year=1979&fveh=2994