The O-ring (409-cylinder Head) is the most widely applied product in the XJ900S 2000 4KM9 IRELAND 104KM-300E1 CYLINDER ( four times ).
The Washer, Plain (663) is the lowest priced item on this Cylinder schematic.
A sample from the products for the Cylinder include: Washer, Plate (371), O-ring (409-cylinder Head), Gasket, Cylinder (nas), Nut (6ta).