<VV> What bearings are these?

[Vairtec Corporation]

Looking for parts in the basement this evening, found two 
new-in-the-box bearings, which were not what I was looking for, and 
which I cannot identify.

Federal Mogul Bower/BCA M88010

and

Federal Mogul Bower/BCA M88048

My hunch is that they are differential bearings, but I don't want to 
guess.  I would rather get them correctly identified and labeled.

Anyone out there know these numbers?

--Bob Marlow