It's 0.787 inches, 20 millimeters by 2.047 inches, 52 millimeters by 0.874 inches, 22.2 millimeters SKF 5304 A-2RS1/W64 angular contact ball bearings.
0.787 Inch | 20 Millimeter x 2.047 Inch | 52 Millimeter x 0.874 Inch | 22.2 Millimeter  SKF 5304 A-2RS1/W64  Angular Contact Ball Bearings