In this schematic the "O-ring,7x1.7" is used most often.
The Bolt,flange,6x14 is the cheapest item from this partsfiche.
Parts such as the Main Valve Body: O-ring, 7.6x1.9, Solenoid Assy B ., O-ring, 11.7x1.9, Linear Solenoid A are included in the Trx680fab 2011 (b) Australia Main Valve Body parts fiche.