If the '98 uses the dual mass flywheel, you could most likely retrofit to an 850 flywheel. (Or maybe the naturally aspirated models use a one-piece flywheel?)
But, you would have to pay attention to bell housing lengths or you could find that the clutch won't engage / disengage properly if the distance between the pressure plate and the throwout bearing is not what was originally intended. (I guess you could fabricate a spacer to go behind the throwout bearing, if the distance becomes greater).