Here are a few pictures of my 1970 240Z stalk switches. When I got my z, it had the wrong light/wiper switch in it. Here is a picture of both sets of switches.
Top switches are for series 1. Notice that there is no intermittent wiper, only two speeds, slow and slower

. The lower one has a longer pigtail on the turn signal side and has a three position wiper selector switch. slow, slower and intermittently slow...

I think yours is supposed to be the lower one.
Here is a close up of the upper set. Again, probably not supposed to be in yours, but you never know what somebody may do.
And here is the lower switch set. Notice that the three pinned blue wires coming out for the wipers were not in a connector. This is how it was removed from my car, except for the fact that they were all wrapped together with electrical tape

. I eventually figured out that I had the wrong switch in my car and swapped it out with the correct one for me.
and... I agree with evildky about those black wires being for the door switch.
Let me know if you need some more pictures.
Gord