In this schematic the "Seal,piston" is used most often.
The most reasonably priced component used on the Rmx250 1989 (k) Usa (e03) Front Caliper (model M/n/p/r/s) is the Washer,wave.
This Caliper Assembly,front,right is the most expensive of the items that make up this Front Caliper (model M/n/p/r/s) assembly.