Will a 17 wheel from an 02 Pathfinder or a 17 wheel from an 05 Titan fit my 02 X ????

of course, 6x5.5(139.7) lug pattern. from one nissan to another i don't see why not.
unless the tires are too big for the wheelwell.

I don't know why it wouldn't....6 lug right? My X came stock with 17" rims

there was a girl that did that not to long ago and had pics of it. it was if im not mistaken, a black 02 with titan rims on it.

as long as the wheel is not too wide it should fit

Another question. Would i have any problems if all my rims are 17 x 8. Would a 17 x 7.5 be a whole lot different? Thanks