Sonnax offers replacement pump bushing 41005-01 for Mitsubishi F4A41/42/51, F5A51, R4/V4A51 and R5/V5A51 pumps. Correct installation requires staking the bushing into the pump housing. This series of pumps are difficult to reassemble properly. There are no pins or mating features to ensure proper alignment of the pump halves. Sonnax pump alignment tool 41005-TL will correctly align the pump halves during reassembly.