The Washer,sealing 6 is the most widely applied product in the ST1300 PANEUROPEAN 2008 (8) ENGLAND / MKH MME GASKET KIT B ( four times ).
Some items from this specific schematic: O-ring,24.4x3.1, O-ring,30mm, Gasket,water Pump, O Ring.
The Gasket Kit B is made up of components including this Washer O-ring Kit which is the most expensive.