This Caliper Assembly,right is the most expensive of the items that make up this Front Calipers assembly.
In this schematic the "Seal,piston" is used most often.
Parts such as the Front Calipers: Piston Set, Pad,brake (mca), Seal,wiper, Spring are included in the Gsxr750x 1986 (g) (e01 E02 E04 15 16 17 18 21 22 24 25 34 39 53) Front Calipers parts fiche.