http://www.xterraownersclub.com/ubb/ultimatebb.php?ubb=get_topic;f=24;t=001274
http://www.xterraownersclub.com/cgi-local/ultimatebb.cgi?ubb=get_topic;f=24;t=001315
http://www.xterraownersclub.com/ubb/ultimatebb.php?ubb=get_topic;f=24;t=001311
http://www.xterraownersclub.com/cgi-local/ultimatebb.cgi?ubb=get_topic;f=24;t=001238
http://www.xterraownersclub.com/ubb/ultimatebb.php?ubb=get_topic;f=24;t=001167
http://www.xterraownersclub.com/ubb/ultimatebb.php?ubb=get_topic;f=24;t=001128
If you're supercharged:
http://www.xterraownersclub.com/ubb/ultimatebb.php?ubb=get_topic;f=24;t=001097
And in case none of those have this link:
http://www.nissanoffroad.net/how_to/plugs/plug.asp