Battery Box Capture Nut.
Recepticle for the Battery Box Wingnut.
Part # 4045400014
Diagram # 11
Part # 0007500250
Part # 4165400114
Part # 4045410071
Diagram # 13
Part # 0009972981
Part # 7131640012
Diagram # 21-05-26
Part # 4045410084
Diagram # 35
Part # 4355400282
Part # 406416BB