Kara, I destroyed the receipt for the bearing and therefore cannot give the part number to ask for. iF YOU TAKE THE DEFECTIVE BERING TO NAPA or ADVANCE THEY CAN TAKE THE MEASUREMENTS WITH A CALIPER AND THEN LOOK UP A BEARING CROSS REFERENCE. IT TURNS OUT TO BE A PILOT BEARING. MY FAN HAS BEEN WORKING PREFECTLY WITH THE REPLACEMENT BEARING.