This is a brand new starter drive for tractors. This is used on models 2000, 3000, 4000, 5000, all with the gas engine and 8 speed transmission. This replaces part number D2NN11350B. Thanks for looking!! OEM: /New – C5NF-11A108-A, C5NF11350B, D1NN-11350-A, D2NN-11350-B, D2NN11350B, EC0N11350B, SD173 Model: /New – 2000, 2110, 2120, 2150, 2300, 230A, 231, 2310, 234, 2600, 2600V, 2610, 2810, 2910, 3000, 3055, 3110, 3120, 3150, 3330, 334, 335, 340, 3400, 340A, 3500, 3550, 3600, 3610, 3910, 4110, 4140, 420 LOADER, 4330, 4340, 4400, 445, 4500, 4600, 4600SU, 4610, 5000, 530A, 531, 5340, 535 LOADER, 540, 540A, 545, 550 LOADER, 555 LOADER Tech. Data: 10 tooth, 3-4 spline, 12mm Id, 31.55mm gear, 77mm L 1100-0306