6818D
Rear wheel weight.
Farmall / IH tractors: C, Super C, 200, 230, 300, 350, 400, 450, 504, 544, 656, 666, 686, 706, 756, 786,766, 806, 856, 886, 966, 986, 1026, 1066, 1086, 1206, 1256, 1456, 1466, 1468, 1486, 1566, 1568, 1586, 3088, 3288, 3688, 5088.