Parts such as the Valve: Cotter, Valve, Pad, Adjusting, Pad, Adjusting, Spring, Valve Inner are included in the Xt350'88 1988 55v0 Holland 1855v-300e1 Valve parts fiche.
On this parts fiche the Cotter, Valve is the most specified component.
Of all the components that make up this Valve the Seat, Valve Spring has the lowest price.