These outer race rotates bearings are for use in Tilton Hydraulic Release Bearing Assemblies.
The press fit bearings have an I.D. of 50.8mm where they press on the piston.
The flat face press fit bearing has a contact face of 47-66mm diameter.
The radius contact press fit bearing has a contact diameter of 54mm.
The older style flat face bearing was retained with an O-ring and was used with the old style 62-620 and 62-620L pistons.