Parts such as the Crankshaft (model H): O Ring(d:2.4,id:21.8), Washer, Connection Rod, Circlip are included in the Lt250r Quad Racer 1985 (f) Usa (e03) Quadracer Quad-racer Crankshaft (model H) parts fiche.
In this schematic the "Circlip" is used most often.