OK, on a second gen, one horn is in left side of fairing, second is on right side next to the passenger foot rest. I bought a mount from one of our member vendors and mounted my Stebel behind the passenger foot rest... Wired in tandem with fairing mounted stock horn through a relay. Works like a charm.
On the picture, you can see original stock horn I left on bike(not plugged in) just in front of rear exhaust pipe behind trannie cover, and the Stebel behind the same exhaust pipe, behind the passenger foot rest.