No horn on the 66 Barracuda

I just replaced the turn signal switch in my 1966 Barracuda. My horn was not working as well so I figured I would look into this also. When I pulled the horn button off, to my surprise there was a tuna can there. The previous owner must have used it just to put the horn button back on. I was wondering if anyone has a diagram of what is supposed to be there so I can get the proper parts to put it back together and have my horn back.