First let me say that I am sorry for no good pictures but, my camera is broken, so my son took 2 pictures with his iPhone.
Anyway, this horn will fit where the stock horn is located but, you have to make some minor modifications.
I used the following horn:
Stebel Nautilus Compact Dual-Tone 12-Volt Motorcycle Air Horn
Plug-n-Play Wiring Harness for Stebel Nautilus Compact Air Horns
The Stebel horn is very tight fit. I don't think you could get a bigger horn into this spot. The wiring kit was perfect length.
I had to use the factory radiator bolt hole to mount the horn. So now that one bolt holds the horn and radiator mount.
The horn sounds a lot better and louder than stock. I mounted the relay by the battery.
If anyone has any questions, please let me know.