Found this topic:
http://www.xterraownersclub.com/ubb/ultimatebb.php?ubb=get_topic;f=4;t=003929#000000

And then there's this one:
http://www.xterraownersclub.com/ubb/ultimatebb.php?ubb=get_topic;f=4;t=002517#000000
Says that they should come in 4 pieces