It's a spring with contacts on the ends, one bigger than the other. One fits in the turn signal switch, the other goes in the steering wheel. These are sold by any parts vendor. You might want to buy a few extras, the big ends of the repro are brittle and break easily. I went to replace one on a 64.5 recently, it was broken. I put in a repro in the steering wheel, went to install the horn ring and the replacement broke worse than the one that was in there. Lots of cussing that day!