Two horn conversion question.

Just checked and learned that the radiator yoke support on my 74 Duster was factory drilled with the mounting hole for a second horn. The hole (and its adjacent smaller hole which accommodates the mounting tab) is below the battery tray on the vertical flat rear side of the yoke. Looks like plenty of room to mount a second horn, as the existing horn is mounted to the support bracket at the rear of the battery tray.