I have a brand new pair of front Weathertech Weatherflectors (70120)for sale. These will fit:
NISSAN XTERRA 2000 - 2003
NISSAN FRONTIER 1998 - 2002
NISSAN FRONTIER 2000 - 2002 STANDARD & CREW CAB

These have never been put on. They fit inside the window channel and have no messy exterior tape to deal with.
$38.55 plus shipping