they make a flush mount a side mount and a binncle mount. the flush mount and binnicle take the same buzzer. its on the microfice for the 2001 HPDI I cant remember the part# offhand but its there

good luck and keep posting

ps a quick way to test your alarm horn is to pull the stop lanyard and crank the engine. with the lanyard off the horn will give a staedy tone while cranking if it works.