Tested and working used Hi tone horn. The Hi tone is indicated in raised letters located on the perimeter of the horn. 1969-70 Mercury Cougar and Ford Mustangs used part number C9ZF-13801-B Hi tone. Every horn is bench tested and inspected for cosmetic defects, if they do not function properly, and pass a visual inspection, they get recycled. The used horns at WCCC can be used as-is or you can clean and detail them for you show car.