You planning on installing them in the interior of your X? This is the Mods/Interior section...
www.xterraparts.com has the OEM fog kit, it's pricey no matter where you look, but I see them on Ebay now and then too. Some 02s have the wiring in place already, some don't. See the xterraparts.com page for more info.
You can always install aftermarket fogs, just find a set that fit the holes in the bumper. They have some PIAA ones that do the trick.
Brent