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this is only a tiny fraction of some of the drifferant parts that can go into one style compressor as for drifferant applications. The type of pully for the type of belt, with of belt, size of belt, offset of pully, rear head suction and dishcharge position, types of fitting from the hose to the compressor, bolt pattern, clocking position of rear head, body bolt mounting, magnetic clutch clocking, drifferant pressure sensors, cutout switchs, solenoid valves. Literally thousands of combinations . This is not even talking about any of the electric compressors yet.