The Washer Seal, 6mm is the lowest priced item on this Gasket Kit A schematic.
The Nt650 Hawk Gt 1991 (m) California Gasket Kit A consists of twelve pieces with the Gasket,cylinder H (nas) being the most expensive.
Some items from this specific schematic: Seal,water Pipe,1, Seal,water Pipe,2, Gasket,ex.pipe (nas), Seal Valve,stem.