The Bolt, With Washer(55k) is the lowest priced item on this 30 Meter schematic.
The sub assemblies and components that make up this 30 Meter include this Speedometer Assy, the most expensive part.
Parts such as the 30 Meter: Speedometer Assy, Bolt, With Washer(55k), Nut, Spring(4dh), Nut, Spring are included in the Hw151 2012 52s1 Europe Xenter 1l52s-300e1 30 Meter parts fiche.