Sealed bearings 3.150” O.D., 1.771" (45mm) I.D. Includes M/W produced lock rings. For all housing ends that utilize the large Ford-Olds-Pontiac type bearings, and Modular Housing end bells with 3.150" outside diameter. The bearings retain the original inboard shield that helps preserve the factory pre-lubed grease. For 40-spline axles.