Good info except I believe it is wrong. Synchro and I installed the first "Xterra specific" bars on our trucks, and when he went to pick them up the shop (4x4 Connection) had a Navarra bar lying next to the new X ones--and there were differences, including a welded reinforcement around the bolt holes.
He and I both have bars that required some drilling...what I think ARB means to say is they screwed up the first time they made the "X-specific" bar, but have since corrected the problem. Kind of lame to blame it on the dealers, though, since my install instructions did say the bar was for the "1997 and on Nissan Xterra."
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gothamist -- MAXC member
http://www.beatdriven.com/xterra.html