Inner race is part of the eccentric assembly for the pitman arm. Order 545436 for the jr. sod cutter or 4164681 heavy duty sod cutter for the complete eccentric assembly. The inner race fits inside the needle bearing (521428).
WARNING: This product can expose you to chemicals including Lead and lead compounds, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov