Depending on the brand of bearings in the vehicle, the most likely sources to cross reference bearing numbers are Spicerparts.com/identify, Jtekt-na.com, Timken.com or a local parts auto store for a catalog reference. The brand of bearing that comes with original equipment varies by vehicle manufacturer.
The year, make and model of the vehicle all impact what brand of bearings are installed as original equipment. Timken and Spicer bearings are common OEM in cars manufactured in the US prior to 2012. The major bearing manufacturers offer online parts catalogs available to anyone. For older or less common makes and models, cross referencing bearing numbers may require several sources that are only available at an automotive parts shop or dealership.