The Cushion is the most widely applied product in the TS250 1974 (L) USA (E03) CHAIN CASE ( three times ).
Parts such as the Chain Case: Lock Washer, Bolt, No Product Description Available, Bolt are included in the Ts250 1974 (l) Usa (e03) Chain Case parts fiche.
The most reasonably priced component used on the Ts250 1974 (l) Usa (e03) Chain Case is the Washer (6.5x20x1.2).