Ok I think I found it. Indeed it's part number 251701ET0A
There are diagrams, however a little hidden.
Go for example to
Nissan USA eStore
(you may have to input "2011 370z roadster" at the top)
And then go to "Body Electrical" [E] and then "switches" [251].
Then at the top you can either horizontally scroll some picture, or select a tab for the F/R/S version.
Which will lead to this:
http://parts.nissanusa.com/nissanIma...4/J25101T6.jpg
Voilą.