My Alfine 8 and Nexus 8 kits have come with the open cj. I bought a weather proof cj like yours but I haven't installed it because to date I haven't had any issues (3 Chicago winters). My guess is that if the cable housing opening is facing downward then H2O doesn't get in. I'm running oil in two of my three hubs, the oiled hubs shift better in cold weather, the oiled hubs are louder in the summer. Once the hub needs maintanience it's hard to do anything except oil it.