missing omega crown and stem , seamaster 120

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A friend came to me with his brothers watch - a Seamaster 120m 166.073 and it has been sitting for the last 40 years .
the watch is missing its crown and stem .
the crown i believe to be 42062
I would appreciate help identifying those parts , and if someone can source them it will be amazing .
the photo is not his watch , its mine but its the same model .