D90722 Frame to Swing Tower Bushing Upper & Lower Fits Case 580D 580EOne New Aftermarket Replacement Frame to Swing Tower Bushing Fits Case (Fits Case IH) Backhoe Loaders This aftermarket replacement bushing fits both the upper and lower frame positions at the swing tower on Fits Case (Fits Case IH) backhoe loader models. The swing tower bushing is a wear component in the backhoe swing pivot assembly and is used in both the upper and lower frame at swing tower positions on the 580D and 580E series machines.