Maybe one of these similar products would be of interest:-
12v Universal Motorcycle Chrome Horn 12 volt 110db
12 VOLT CHROME HORN IDEAL FOR CHOPPER BOBBER / CUSTOM /CLASSIC MOTORCYCLES
12 Volt Chrome Horn Ideal For Chopper Bobber Custom Classic Motorcycles 110 dB
FOR VESPA SHELL 12 V VOLT AC HORN CHROME PX 125-200 VBB SPRINT VBA SUPER