On this parts fiche the Wash,sealing,7mm is the most specified component.
Some items from this specific schematic: Gasket,cylinder H (nas), Gasket,ex.pipe (nas), Gasket,cylin.head (nas), Gasket,tensioner (nas).
The Gasket Kit A assembly is constructed from several parts from which the Gasket,cylin.head (nas) is the most expensive.