I imagine they probably had spotlights and all that would plug into them. I never saw anyone who used the little port. Googling it, looks like they are about $20. It may be cheaper and easier just to buy a 2 wire pigtail. Wire it to the battery and have it zip tied to the frame.
Here is the[font=verdana, geneva, lucida, 'lucida grande', arial, helvetica, sans-serif]
part # for the honda part[/font]