D42875 Swing Cylinder Seal Kit Fits Case 310E 310F 310G 450 750 850 1150 530 580One New Replacement Swing Hydraulic Cylinder Seal Kit Fits Case Loader Dozer Application: Backhoe Swing Model: 310E, 310F with Backhoe Model 31 Serial#: 2019001 3023000 Model: 310G with Backhoe Models 26, 26B, 26S, 32, 33 Serial#: 3023001 3032321 Model: 450 with Backhoe Models 26, 26B, 26C, 26S, 32, 33, 35 Model: 750 with Backhoe Models 32, 33S, 34 Model: 1150 with Backhoe Models 32, 34, 36 Model: W7, W7C, W7E Model: W9, W9A, W9B, W9C, W9E, W10, W10B,