The thirty Cb750k 750 Four K 1980 (a) Usa Oil Filter / Oil Pan component parts are all listed in this schematic.
A sample from the products for the Oil Filter / Oil Pan include: Washer,plug Drain 14, Bolt,flange, 6x32, Strainer,oil, O-ring,15x2.5.
In this schematic the "Bolt,flange,6x28" is used most often.