I have a 1967 Johnson Super Seahorse 33hp that was used on a boat with a steering wheel. The model number is RXEL-15. I rescently bought an aluminum boat and want to convert the Johnson motor to a arm control or a tiller control. I need to know what motors are interchangeable, and if anyone might have one on an old parts engine they might sell. I also need the electric control box and gas tank. Any help is appreciated. Cien