Up for sale is a new TIMKEN JM718110 Taper Single Cup Bearing Race.   This part was originally ordered for a John Deere 770.  I would guess that this number would fit other wheel bearings.

5.7090" Outside Diameter, 1.0630" Width
 

Product Features

• Single cup (outer ring) for connecting to cones (inner ring assemblies, sold separately) to form a complete single tapered roller bearing
• Supports both radial and axial loads between a rotating and non-rotating member
• Operating temperatures range from -54 to 120 degrees C (-65 to 250 degrees F)
• High alloy steel for durability and heat tolerance
• Open configuration for lubrication applied in place

John Deere Part Number JD9141

National Stock Number 3110-01-037-5496