What the hell is a "sun visor with lighted mirrors"? Is that like those old Chevy trucks used to have? If a dealership has them, you're probably describing them wrong in terms of an Xterra, cause I've never heard of such a think at a dealership as they only carry stock stuff.
It sounds you know both these things are at the dealership, so why not go there? I'm not sure why you would want OEM fog lights as they suck.
And you can't find this stuff, so why give us a hard time about not knowing either.