Dimensions: 0.64" X 47mm X 12mm X 0.72"-thick Outer Ring - Ext Inner Ring - Trash Sealsused On Allis Chalmers Self-propelled Models A, A2, B, E, E3, F, F2, G, K, K2, L, L2, M, Mh Hillside, Mh2 Hillside, M2 Rice, N5, N6 Rotary, N7, R. Grain Headers: F, K2,