The most reasonably priced component used on the Vt1100t Shadow 1100 Ace Tourer 2001 (1) Usa Cylinder Head (rear) is the Screw,cross 5x8.
A sample from the products for the Cylinder Head (rear) include: O-ring,35.3x2.4, Bolt Socket 6x35, Plug,spark (x20ep, Spark Plug(dpr6ea.
On this parts fiche the Bolt,socket,6x20 is the most specified component.