Parts such as the Topbox *r302m*: Spr Dr Lock Key, Chrome Parts, Top Bo, 35l Top Box Velvet R, Pad Cover, Top Box are included in the Sh125rb Sh125r 2011 (b) England / Mkh Stc Topbox *r302m* parts fiche.
The Spr Dr Lock Key is the cheapest item from this partsfiche.
In this schematic the "Pin Hinge" is used most often.