A Vehicle Specific item is specifically designed for the exact measurements of your vehicle. No alterations are required.

A universal fit item is designed to fit and work with almost any vehicle. It will work with your vehicle, but may require some modifications to fit exactly.
RV > Horns : SIREN HORNS
 
WOLO MINI MOTOR-DRIVEN SIRENS
$27.99
Small in size, but noticeable big sound! This siren is exceptionally great for emergency vehicles, boats, etc. Fits easily even in tightest engine compartments.

WOLO ALERT™ SIREN AND PA SYSTEM
$313.99
Commercial Grade. Ideal for use by EMS, fire rescue, police, ambulance or other emergency vehicles that need to capture motorists' attention. Designed with state-of-the-art electronics throughout to provide years of dependable service. With the touch of a button you can select from three powerful emergency sirens: WAILER, YELP and AIR HORN.

WOLO 110dB MOTOR-DRIVEN SIRENS
$36.99
Blaring 110dB big police car/fire truck sound plus a bright chrome-plated under-hood look! Chrome-plated metal siren horn features heavy-duty permanent magnetic motor for years of reliable service.

WOLO 20 Watt ENFORCER SIRENS
$31.99
Three emergency-vehicle sounds (police car, fire engine, ambulance) plus Truck air horn at one low price. Rustproof high-impact construction. The siren horn mounts anywhere in vehicle and features a separate button for each sound.