If you cant find an original replacement, with some modification you can use one of these. Its a 2 spark coil so you will have to ground the lead you don’t use. This 2 lead coil is actually a plus as it moves the spark plug wire away from the crankshaft. https://www.ebay.com/itm/232218550107
A "Boathouse Repair" is one thats done without having tools or the skills to do it properly.