The rear hatch area plastics are held on by a mixture of metal clips and plastic pins. There is no good aftermarket replacement for the metal clips I have found. You may be able to buy them, but it is probably just easier to go to the junkyard and start looking in some random nissans for that clip. All 90s nissans will have at least a few of em in there. Sorry but that is my best advice, now go scavenging!