Adapter Kit: OEM Suzuki GSXR Shock to Kawasaki Ninja 400 / Z400 (OEM Suzuki GSXR Shock NOT included) A great, budget friendly shock upgrade for your Kawasaki Ninja 400 / Z400 is to use the OEM shock from a GSXR600 or 750/1000 (depending on your weight). However the GSXR shocks are much too short, about 315mm, for proper ride height on a Ninja 400 (The OEM Ninja 400 shock is 320mm for reference). You can solve this by reversing the upper shock mount on the Ninja 400, which provides the necessary additional 14mm of ride height to get the overall length right in the middle of the ideal range for aggressive riding and track use. However, when you do this, you can no longer use the OEM battery box mounts, so this kit includes new battery box mounts and spacer washers for the lower mount to fit the GSXR shock. Now you can get the correct ride height and keep your battery box mounted solid. A perfect, budget friendly shock solution for your Ninja 400 or Z400!