Go back to your local Nissan dealer and look at all the Xterra's on the lot, when I did I noticed that NONE of the squares, openings, whatever they are were molded the same. Seems like some poor QC in that area of the plant. I have an early model 2k however all the X's I looked at were 01's....so I'm doubting that this problem was ever corrected in the later models.

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2000 Solar Yellow XE V~6 4x4 that runs like a dream and has had zero problems ever
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04' SVT Focus, EAP, Pitch Black, ZX5