all G3 Integra's use the S80/Y80 trannies. B18B1's are mated to either S80 or Y80. GSR's use only S80, as does the ITR but that's stamped with "LSD" to give a difference. The bellhousings are different slightly. Y80 trannies wont fit an ITR LSD, but the S80 will (if not equipped already).