P/N 7170-0242 Sprocket Series 2400 18-Tooth 2in Round Bore Key 2ss Split Sprocket 5.8in Pitch, M24Z1804R03- MAC-2SS P/N 7170-00250 Sprocket Series 2400 18-Tooth 2-1/2in Square Multi Hub Split Sprocket Habasit 5.8in Pitch, M24Z18HL250Q8