I have a 53 Seak King (Gale) 5hp. I am looking to move the powerhead from 1midsection/lowerunit to another. I will need to replace the trapezoid shaped gasket and I am fairly certain I can not buy a new gasket. The question is what gasket material do I use to make a new one. I have the gray construction paper looking stuff you buy at an auto parts store. I also have punchs for the holes. My other thought was copper but that may be overkill. The exhaust output and water input and output go through this connection.