Parts such as the Rear Caliper: Piston Set, Pin,pad, Bolt,housing, Pad,brake are included in the Gsxr1100 1988 (j) (e02 E04 E06 15 16 17 18 21 22 24 25 34 39 53) Rear Caliper parts fiche.
The sub assemblies and components that make up this Rear Caliper include this Caliper Assembly,rear, the most expensive part.
On this parts fiche the Seal,piston is the most specified component.