The most reasonably priced component used on the Gsf1200s 1997 (v) (e02 E04 E17 E18 E22 E24 E25 E34) Oil Cooler is the Spacer (6.8x10x10).
On this parts fiche the Gasket(16x22x2) (nas) is the most specified component.
Parts such as the Oil Cooler: Cooler Assy,oil, Guard,oil Cooler, Union, Gasket(16x22x2) (nas) are included in the Gsf1200s 1997 (v) (e02 E04 E17 E18 E22 E24 E25 E34) Oil Cooler parts fiche.