I'm rebuilding a 3F motor and in the process bought a "full" gasket set believing all gaskets needed would be included. It does not have whatever it is that seals the two halves of the exhaust gasket together. In my limited experience of engines I have never seen a setup like this. Local parts shops all seem to be staffed by people who have difficulty in even conceptualising that there was a time before 2000 when vehicles were made. There must be a lot of these engines around. Does anybody know of an aftermarket source for the gasket or an alternative "fix"?