The most reasonably priced component used on the Gsx550es 1985 (f) (e01 E02 E04 E06 E17 E21 E22 E24 E25 E26 E34 E Front Calipers is the Bolt 10x37.
The Front Calipers is made up of components including this Caliper Assembly,right which is the most expensive.
On this parts fiche the Pad is the most specified component.