Yes, they will fit all 00-04 Xterra's. The suspension didn't change untill the 05's. You can save yourself some money by buying the shocks from either shockwarehouse.com or eshocks.com. I ordered mine from shockwarehouse and they were only $65 each with free shipping. The part numbers you will want are B462126. They are for the toyota T100 trucks but they fit our lifted aplications just fine.
Axle
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My wife - "We haven't even made a payment on it yet and you're scratching it all up!"