I just installed mine, took about 20 minutes.
Those instructions are for the 350Z and are what come in the box with the new mirror.
They are spot on for the 370, except for the wire locations. The green ignition wire is in the top fuse junction and the red battery wire is in the bottom one, verified with a meter before the install.
Here is a pic of which wires you need, other than that, its just as the instructions say.
