The center spray arm part that I needed to replace (again, after several years) is no longer available. The spray arm that this kit comes with is shaped differently where it meets with the water output on the back wall than the current part so I had to use the included tray brackets to change the height of the upper rack. The new bracket's wheels did not fit inside the metal rails properly so I switched to the wheels from the old brackets using pliers. I had to use the new upper tray since the new side brackets were sized to snap into the thinner gauge wire that the new rack was built from and would not fit the upper rack that matched my dishwasher. Finally, I had to transfer all the upper rack accessories to the new rack.