One New Aftermarket Replacement Planetary GearFits Case-Fits International Harvester Models:580L, 580L Series 2, 580M, 580M Series 2, 580M Series 3, 580SL, 580SL Series 2, 580SM, 580SM Series 2, 580SM Series 3, 580SM+ Series 2, 580SM+ Series 3Tech Info:ID: 1 11/16"Number of Teeth: 23OD: 3"Width: 1"Replaces Part Numbers:100562A1, 125455, 1-33-742-637, 1537650C1, 6914500, 85806014