D135742 Bushing inner boom pivot Fits Case 580K, 580SKOne New Aftermarket Replacement Inner Boom Pivot Bushing Fits Case (Fits Case IH) 580 Series Backhoe Loaders This aftermarket replacement bushing installs at the inner swing tower where the boom pivots, serving as the wear interface between the boom pin and the swing tower on Fits Case (Fits Case IH) 580K and 580 Super K backhoe loaders. The inner swing tower bushing features a retaining lip that distinguishes it from the outer swing tower bushing