The most reasonably priced component used on the Gsx250e 1982 (z) General Export (e01) Chain Case - Shock Absorber is the Lock Washer.
Some items from this specific schematic: Nut, Lower Lh, Washer, Washer, Washer (12.5x24x3.2).
The Suzuki CHAIN CASE - SHOCK ABSORBER has fifteen products enlisted in the schematic.