Some items from this specific schematic: O-ring 18x3, O-ring,13.8x2.5, O-ring,27x2, Gasket,l Crankcas (nas).
The Xl500s 1979 (z) Usa Gasket Kit B consists of thirteen pieces with the Gasket Kit B (as) (nas) being the most expensive.
The O-ring 18x3 is the lowest priced item on this Gasket Kit B schematic.
