Check out any of the thirty-one Oil Pump - Oil Filter components enlisted.
The most reasonably priced component used on the Gs650gt 1982 (z) (e01 E02 E04 E15 E16 E17 E18 E21 22 24 25 26 34 Oil Pump - Oil Filter is the Bolt.
A sample from the products for the Oil Pump - Oil Filter include: Gasket(14x19.2x2) (nas), Screw 6x12, Regulator Assembly,engine, Shim.