Replace Part Number: The part number for reference is F87Z 3B457 AA, F87Z3B457AA. OEM: F87Z 3B457 AA, F87Z3B457AA. Item Type: Front Wheel Axle Retainer Ring. 1 x Front Axle Retainer Ring. Cost Effective Solution: Provides a cost effective solution at a low part cost, ensuring the normal operation of expensive transmission system assemblies (differential, axle), and preventing larger losses.