Hey,
You guys may have seen this before but I hadn't. Tirerack has a Eibach strut bar for the Sentra, check the link:
http://www.tirerack.com/suspension/eibach/strutbrace.jsp?autoMake=Nissan&autoModel=Sentra+SE&autoYear=1998&category=Brace&make=Eibach&model=Eibach+Pro-Control+Bar+Kit