Has anyone here replaced a heater core in a 77-79 Lincoln Continental with auto climate control? I think maybe even 74-79 would work. When I took mine out, the rubber gasket that surrounded it had totally rotted. I can't get a replacement online, and I doubt anything in a junkyard would be of any good. I think it was there not to stop leaks, but just to cradle the unit so it doesn't move around.