They don't make a rear.
C-West and Carisma have a two piece rear lip, and there's also the JDM, OEM, Kaminari, Ro_JA, APC (stay away from them
), Razzi and Vizage and mayb one or two more make rear lips for the RSX. I'm 99% sure te RO_JA is polyurethane and I know for sure the OEM and JDM aren't fiberglass. Not sure about the rest.
http://thersxsite.com/body.html is a list of all 02-04 RSX body kits.