It seems NISMO has not forgotten the Xterra's or the Frontier's. At a recent Overland Expo West event, they announced that NISMO is now showcasing (and producing) several off road components to keep the outdoor enthusiast happy.
-NISMO front Bumper
-NISMO rear bumper
-NISMO/Bilstein 5100/5165 res. shocks
NISMO 17x7.5" offroad rims
-NISMO/Magnaflow exhaust
-NISMO offroad Lights
-NISMO roof-top tent