Direct Replacement. Strict control standards to Build and test. Note?Chrome Roof Mount Low Tone Air Horn with Base Mount. Some might have small scratches and dents from been storage! Please do not buy it if you mind? Will Fit: Compatible with Peterbilt, Compatible with Kenworth, Compatible with Mack, Compatible with Freightliner, Compatible with Ford. Features? Easy install Simple operation Package Include: 2 x Low Tone Air Horn with Mounting accessories (as shown in pictures) Product Information: Shipping Weight: 181OZ Package Dimensions: 26.18 x 9.25 x 10.64 inches Model Name?Low Tone Air Horn