I'm currently overhauling my 1965 220S M180 and ran into a similar problem. One of the generator/alternator studs was broken and my instructor welded a nut on the broken stud and I was able to extract it. Now I need to get a new stud. I also have two missing engine mount studs so I also need them as well.
Thanks
Warren Bain 1965 220S, 1989 300SE, 1989 420SEL, 2002 Ford Crown Vic Police Interceptor