clutch slave cylinder info

would anyone know if any of the series models have different slave cylinders?
i am looking for more "throw" ..
i am using genuine new master cylinder (range rover 1971) with oe slave agian range rover classic..ITS a classic rr...
i was hoping that prehaps serries slave is of a smaller bore,thus giving more throw with same pedal input,(but with more effort i know)

thanks