Troy-Bilt Horse Tiller - 2 Axle Seals (9621) Includes two axle seals for Horse model tiller MTD 921-04031 Troy-Bilt: 9621 Troy-Bilt: 119 Troy-Bilt: 921-04031 Troy-Bilt: GW-9601, 9601 Dimensions: 1 1/2 x OD x 1 ID. Other part numbers W-9601, GW-644, GW-602, 921-04031, 721-04031, 49-051, 240-804, 161-552