Link Arm Mounting Pin Castle Nut Models 4000, 4600, 5000, 5110, 5600, 5610, 5640, 5640, 6410, 6600, 6610, 6640, 6640, 6700, 6710, 6810, 7600, 7610, 7700, 7710, 7740, 7740, 7810, 7840, 7840, 7910, 8340, 8340