The part your looking for is for the Pehlon ignition. The complete ignition doesn’t come up for sale very often although Doug Penn sold one recently. It sold the next day. Finding the cam separately is even more uncommon but they do show up from time to time. If you should find one on eBay don’t be surprised if they are asking $100.00.
A "Boathouse Repair" is one thats done without having tools or the skills to do it properly.