Hex nut 3/8-16 thd.
Genuine OEM Part - Manufacturer #712-0798
Jam lock nut, 3/8 - 16
Genuine OEM Part - Manufacturer #712-0266A
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Nut
Genuine OEM Part - Manufacturer #712-0375
Hex nut 5/16-18 thd.
Genuine OEM Part - Manufacturer #912-0158
Hex nut
Genuine OEM Part - Manufacturer #912-0287
Nut-hex jam lock
Genuine OEM Part - Manufacturer #712-0413