Originally Posted by A_Vasiliev
They look like adapter cups of some sort. Are they to mate the Ninja fork to the Versys frame?
the 650R and Versys share the same basic main frame, and therefore the same steering stem and bearings, making the front ends directly interchangeable. putting the versys usd front on the ninja frame works real well for a DS conversion, but you would never consider doing the reverse.
versys usd forks on left, 650R forks on right. both have 41mm inners. you can see the relative size of the clamps. the 41mm 650R clamps allow the direct bolt in of the 08 and up 41mm KLR forks and this has been done, but those 650R clamps sure look small for a sustained offroad pounding.