MTD Original replacement Snow Thrower Runner (42010). Common on the following Troy Bilt snow blowers: 42000 21" Self-Propelled, (S/N 420000100101-420001199999) 42012 26In.
This will replace the following part numbers: 1724868 , 1728567 , 1728567010 , 1728567021 , 1728567BDG , 1728567GAR , GW-1728567001 , GW-1728567010 , GW-B1728567GAR