Try searching "spacers" in the Tires, Wheels, and Suspension section next time, I found a few threads there:
http://www.xterraownersclub.com/cgi-local/ultimatebb.cgi?ubb=get_topic;f=37;t=001616
http://www.xterraownersclub.com/cgi-local/ultimatebb.cgi?ubb=get_topic;f=37;t=001116
http://www.xterraownersclub.com/cgi-local/ultimatebb.cgi?ubb=get_topic;f=37;t=001025

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Brent
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