The area where the T.O. bearing pushes on the pressure plate diafram fingers on a OS or HKS is a different size. The design of the pressure plate on the Twin Disc carbon-Carbon from RPS is diffrent as well and comes with a different style T.O. bearing. The stock style pressure plates do not have enough room for twin Disc's. The reason for the different stlye bearings is only to fit the pressure plate fingers , Not for Quality.
