[frankc]

There is some more info here about the sway bar mount for 74-77 vs. 78+ trailing arms:

http://forums.pelicanparts.com/porsche-911-technical-forum/550663-1974-1977-sway-bar-question.html
http://forums.pelicanparts.com/porsche-911-technical-forum/381841-77s-sc-drop-link-conversion-questions.html
http://forums.pelicanparts.com/porsche-911-technical-forum/301988-911sc-rear-suspension-swaybar.html

And many more links if you search for " trailing arm drop link ball"