One of the forum administrators, AK370Z, posted about the fog light install in 2009, including pictures. Post is dated 11-24-2009 and titled "DIY Fog light install with new harness for US-Spec 370Z + Radar harness w/pics.
Tried to reply to your PM but couldn't for some reason.
I tapped into the passenger seat heater switch. Found a diagram of the heater switch online and tapped into the 12V in for power. The Z Store harness is pretty complete and includes a relay so you only need 12V power and a 10 mm bolt to secure the ground wire. The switch is illuminated so I clipped the illumination power wire just below the plug and wired it into the heater switch illimination wire so it brightens and dims with the other interior switches. This step is not really necessary but I think it makes the switch look more like factory original. There is a good sized pass through from under the console into the cargo area and atcleast two grommets, at the rear below the tail lights, that can be used to route the harness out to where the fog light mounts. There are plenty of how-to's on this forum that describe how to remove the reflector and install the light.
Be careful pulling the switches out of the brackets under the cup holder as they are a little fragile.
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