Parts such as the Gasket Kit B: Gskt,ck/c (nas), Washer,oil Bolt, Gasket,r.crankcas (nas), O-ring,13.8x2.5 are included in the Trx250x Fourtrax 250x 1991 (m) Usa Gasket Kit B parts fiche.
In this schematic the "Washer,11m/m" is used most often.
Of all the components used in this assembly the Gasket,r.crankcas (nas) is the most expensive.