Adapter to mount a SKS mudguard (shockboard or shockblade, both tested) on a LEFTY-fork from Cannondale.  The adapter is extended in length by 2cm to avoid any contact of the mudguard with the fork. Comes complete with stainless screw and nut. 
 
The adapter covers steering pipes from 34.8 to 35.8mm inside diameter, common in most Cannondale lefty forks and fits for all 26", 27.5" and 29" wheels.