Which Fabtec kit is this? I'm only finding Frontier and Titan kits, do they have X kit? And who's Justin, a workshop you can recommend?
Did you get the ARB locker from RuggedRocks?
It is the Fabtec Frontier Lift kit. To my knowledge so far OZ, Mastagrog and myself have installed them. The front axle cross-members and such are bolt compatible between the X and Frontier. The difference is the Rear Axle. The X is spring under axle and the frontier is spring over axle. So Justin at AOE flipped my X to Spring Over Axle to get the added height. Had to weld new spring perches, relocated my lower shock mounts, kept my longer shackles and AAL from PRG and used the longer shocks from the Fabtech Kit in the rear. A word of warning!!! The driveshaft has to be lengthened... Don't waste your time if you aren't willing to go to JE REEL in Pomona and get a Double Cardon drive shaft fabricated by them. They have a lot of experience with lifted Xterra driveshafts.
My front ARB locker and compressor came from RuggedRocks. With regards to the front locker. Find a competent experienced well-referenced installer. Lockers have not been installed in the R180 for very long and it takes real skill to get it right. I can give you an option if you want