Old Man Emu is the bees knees.. WETF that means..
Last I talked with the head of engineering about OME for Xterras, one 'unofficial' option is to run the OME front suspension (coils/shock) for a Nissan D40 Navara. This is what Kneebuster here on the newX was running for a time - a year or so ago.
Here's an email from Marc Bowers @ ARB from Sep '09:
D40 Navarra stuff will work, and the heavy coils may give you the 2 inches of lift you are looking for, but you'll need at minimum new upper control arms (we don't need them with the 1-1.5" lift we build for) and possibly some other parts to correct steering geometry/cv angles etc.. Also, we've confirmed the Navarra rear shocks are a bolt in for there Xterra and will work with 2-3 inches of lift without problems (they are longer than stock) with the Sport models offering extremely good ride/handling.
OME is very high quality, almost every vehicle I've owned, and my buddies own have OME suspensions. Very durable, robust, and high quality.
Marc did mention that OME was in the process of developing a leaf pack for the Xterra as well. In September that project was reported as 6 months out. I'm checking back with Marc to see where it's currently at.
One more note, if you do order some OME for your Xterra, go with the Sport shocks. If you've ever used the 'Nitrocharger' OME shocks, and know first hand how BA they are, the Sport shocks will leave you baffled due to their superiority.
Here's the part numbers that you would order to get the front shocks/coil, and the rear shocks for the D40.. These will work on the Xterra.. Myself and Kurt at CruiserOutfitters are going to start toying around with OME options once we get the shop finished up in April/May~ish..