I have a J25ELCTD and the stud sheared off that connects the lower unit through an extension housing to the exhaust housing. The problem that I'm having is it seems the stud that I need is obsolete. It would be between 7 and 7-1/2 inches long and is listed as part 64 on most diagrams. Any help with locating the stud or a different method of attaching these parts together will be greatly appreciated.