Used lot of OMC parts that fit a hydro drive gearcase. Only part number I could find was 315793. These parts came from a large lot of parts from a closing marine shop. I can't speak to the condition of these parts so please pay close attention to the provided photos. Hopefully someone knows exactly what they came from and can use them. The gear has great teeth but does have a couple of tarnished or rusted spots that are very small and does show minimal wear where the clutch dogs engaged. You will get the 4 parts you see in the picture.