Which kind of horn to get?

I would love to get my hands on these:

<center>MODEL 418 POWERHOUSE[SIZE=-1][/SIZE]</center>
<center>ROOF MOUNT CHROME DUAL TRUMPET
120 Decibels 390/435Hz

418.jpg

POWERHOUSE is a roof mount air horn that has dual metal chrome trumpets. Features Wolo's new heavy-duty compact chrome compressor. It produces a sound that is EXTRA LOUD, for the vehicle owner that demands to be heard. Included in kit is weather protector covers for both trumpets to insure many years of dependable service. The POWERHOUSE is a perfect addition for any truck, 4X4, RV, van, etc. So if you want the sound of the big trucks without an on board air tank, then POWERHOUSE is the one for your vehicle. It will look as good as it sounds on your roof. Comes complete with all mounting hardware. Instruction in English / Spanish.​
Longest Trumpet 13-1/2"​
[SIZE=+1] HEAR A SAMPLE OF THE[/SIZE][SIZE=+2] POWERHOUSE [/SIZE]
Sound file is to demonstrate horn's sound not loudness


</center>If I could get it to fit...
 
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