Description Spindle thrust bearing. Tractors: 2N, 8N, 9N, NAA, 231, 531, 600, 700, 900, 2000, 2300, 2600, 2610, 3300, 3600, 3610, 3900, 4000, 4100. This item is a suitable alternative for the following: C0NN3123B, 1104-4008, 11044008, 728306, A575860, A-C0NN3123B, AC0NN3123B, CONN3123B, S.65120, S65120