Just use an old lawnmower wire or a car wire, I had one that got chopped up pretty bad on a fiberglass cowl, I removed it from the coil & replaced it with an old lawnmower wire & slipped the braided ground wire over it, screwed the wire to the ignition box & screwed it to a fin on the engine. I used some silicone when I inserted it in the coil & I shaved the wire off the tip about 1/8", It ran great. If you don't like that Idea go to chignitions.com they should have what you need.

Gil