The most reasonably priced component used on the Vt1100c3 Shadow Aero 1999 (x) Canada / Cmf Oil Filter/oil Pump is the Bolt,flange 6x30.
This Pump Assy,oil is the most expensive of the items that make up this Oil Filter/oil Pump assembly.
In this schematic the "O-ring,14.7x3.7" is used most often.