With \'ears\'. Fits against the crankcase, behind camshaft. This is the locked \'early\' 58-90 model for which a separate thrust washer shim is used to achieve correct camshaft end-play. It is also used in virtually all aftermarket 58-99 single cam engines. Note: For 91-99 OEM cases the MCS 906636 thrust washer is used, which is not \'locked\' since it has no \'ears\'. For this thrustwasher shims for correct end-play cannot be used since the thinnest is already too thick.