Rear axel bearings are pressed in, however, they are not sealed bearings.
Ergo, the old need to be pressed out. A gas station or such needs to do this
most likely. Make note of the positions of the old bearings as they meet
with the housing. Don't press them too far into the  housing. This is just
some stuff to consider before going forward with this repair.

I have had trouble removing the 4 bolts that attach the  bearing housing to
the trailing arm. 22mm maybe?