I removed the bottom center covering and fabricated a bracket out of aluminum
and used one of the frame bolts. It's a simple flat piece bent via vise and hammer to fit , just something I had laying around, and yes I used the stock horn wires, I didn't cut the ends in case I wanted to put it back to stock. just used posi-taps. I expect one could use scotch locks I never cared for them but they would work. The horn I got on ebay. Left the stock horn in place.