The coil I used in the early single cylinder magneto pictured, is what you have. Its found in the OMC universal magneto. I used an older brown one I had laying around. If you decide to try it, it should just fit notching out the laminates for the wires. You will also have to remove the part of the coil the plug wire slips into and solder the plug wire on. A couple coats of liquid tape is recommended. Without a picture of what you have its difficult to provide you with the best information so you will need to do some discovery on your own.
A "Boathouse Repair" is one thats done without having tools or the skills to do it properly.
