Mounting Plates with Vibration Isolators. 15-¼, 13-¼, 12 x 3. Train horn kit for truck/car/semi loud system /0.5g air tank /150psi /3 trumpets check the sellers' true location by clicking on their username. As the sole authorized dealer for Vixen Horns, our focus is on train horns so we can provide you with the best products and service.