The most reasonably priced component used on the Z50js Monkey Japan Rear Fork - Chain Case is the Joint,drive Chain.
Parts such as the Rear Fork - Chain Case: Bush,rabber,fork, Chain,drive (rk42, Fork Assy,rr*nh1*, Case,drive Chain are included in the Z50js Monkey Japan Rear Fork - Chain Case parts fiche.
With two applications this Bush,rabber,fork is the most specified part.