My latest 50 3600 had 2 trumpet horns mounted on the passenger side of the firewall above the heater control valve. One was about 10" long and the other about 12" long. They were mounted side-by-side on 1 bracket. Each horn was insulated from the bracket. There was a relay mounted close to them. I removed them since I couldn't get them to work. I wish I had a picture. I don't know if they were aftermarket or a dealer installed accessory.
