All of the following parts may be found in clutch Pressure Plate assemblies EXCEPT:

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Understanding what makes up a clutch pressure plate assembly helps here. The pressure plate uses springs to apply the clamping force that holds the clutch disc against the flywheel. The release bearing (throw-out bearing) rides against the diaphragm spring and is pressed by the clutch fork to release the clutch when you push the pedal. The throw-out finger(s) are the parts of the diaphragm spring that contact the release bearing to transfer that release action. A centering bearing, however, is not part of the pressure plate assembly—it's involved in guiding and centering the transmission input shaft (often via a pilot bearing or bushing located at the end of the crankshaft). So it isn’t found inside the pressure plate assembly, making it the exception.