The most reasonably priced component used on the Mts620 2006 Usa (multistrada 620) 9151-2271c 008 Timing System is the Screw Tcei M6x16.
This 008 TIMING SYSTEM assembly utilises four Screw(s) - the highest specified component.
Some items from this specific schematic: Elastic-stop Ring Nut, Layshaft Timing, Bearing, Screw Tcei M6x14.