here's the link for the s14 97-98 s15 kit:
http://www.visracing.com/bodykits/nissan/97-98240sx/striker.html
n here's a pic of an s13 w/ it done.
i haven't seen a kit for the s13 yet, but i remember reading that the side fenders won't bolt onto an s13 or s14 chassis so u would need fiberglass copies. if u have an s14 97-98 though then ur all set.