Word from Bilstein is that their shocks for stock Xterra's are available. Here are the part numbers:
Front 4x4: B46-1099-H2
Front 4x2: B46-1099-H1
Rear 4x4 & 4x2: BE3-6422-H0 (zero, not oh)
I was told cost will be about $60 ea.
Lory
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Onward and Forward
or at least Onward
SCCX:
http://www.sccxterra.com/