Seems you're not the first with this question...
Scratch in the metal part?
http://www.xterraownersclub.com/cgi-local/ultimatebb.cgi?ubb=get_topic;f=21;t=000586
http://www.xterraownersclub.com/cgi-local/ultimatebb.cgi?ubb=get_topic;f=21;t=000570
http://www.xterraownersclub.com/cgi-local/ultimatebb.cgi?ubb=get_topic;f=21;t=000563
http://www.xterraownersclub.com/cgi-local/ultimatebb.cgi?ubb=get_topic;f=21;t=000454
http://www.xterraownersclub.com/cgi-local/ultimatebb.cgi?ubb=get_topic;f=21;t=000384
Scratch in the plastic part?
http://www.xterraownersclub.com/cgi-local/ultimatebb.cgi?ubb=get_topic;f=21;t=000570
http://www.xterraownersclub.com/cgi-local/ultimatebb.cgi?ubb=get_topic;f=21;t=000341
http://www.xterraownersclub.com/cgi-local/ultimatebb.cgi?ubb=get_topic;f=21;t=000328
Only $30 to replace the whole thing too.