The 9017916M05 Nut (689) can be ordered. View linked machines. 90179-16M05-00 is the manufacturercode.
The Nut (689) appears in these 50err (50elrr) 1993 parts lists:
KEY, WOODRUFF | 6H41154500
WASHER (689) | 9020116M44
PLATE, TIMING | 6H48133200
OIL SEAL (23X38X7-648) | 9310223096
CLAMP(6J8) | 9046403M15
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