Hello. I, too, am confused because the connectors in my 2002 Boxster S are different from the book. The connjectors from left to right (grey - 1 wire), Blue (lots of wires), and green (lots of wires). I look at the connections in project 91, where I connect the wires to #23, 22, 21, 24. Those are already full with wires on the Blue connector.
The car did NOT come with the fourth stalk (I added that now).
Any ideas?