69 Barracuda Horn button missing.

My Barracuda currently has an aftermarket dash mounted horn. This must go the way of the Dodo. I recently replaced the aftermarket 13.5" steering wheel with a 15" model (also aftermarket) but alas, no horn on the steering column (non tilt). WHAT parts do I need to get the horn button back onto the steering wheel where it belongs? You guys are awesome, and I know you can answer my questions faster than I could research them myself. If you need anymore details, I'll get back with you asap.