I started a new thread about anyone actually doing this but it got canned (sorry, closed). I called a Nissan dealer and found that the light and mounting hardware is $90 per side ($180 per X). That would preclude using the stalk to turn on and off the fogs so you'd have to wire them to their own relay, make sure you comply with state laws, if any, that say only on with low beams, and put a toggle of some sort in one of the blanks on the dash board.

Now the big problem comes in to play, the way Nissan designed the bumper and wheel well precludes any type of easy access like in the 04's and earlier. I'm going to pay my dealer to install the lights and pull wires to the engine compartment, replace the wheel wells and I'll do the rest (they won't install the relays or switches since that's custom work).

I looked into using PIAA 510's (the opening is about 4" across so that the PIAA that fits) but they're over $200 for the set with no mounting hardware so you'd have to have that custom made and that that additional cost they'd have to be hugely better than the OEM lights to justify the cost. I'll know more when I make my final decision on getting an 05 or waiting for 06...