That looks like a 6 cyl rear but hard to tell with that picture being so close. Also can you take another after turning the diff 90 degrees? If you removed the 4 bolts on the axle and there a was a plate that is separate from the backing plate then you don't have c clips. That plate would be for holding the axles in. And most likely the bearing is just rusted inside the housing. You would need a slide hammer with the attachment to mount to the lug bolts and slide hammer it out. make sure the car is on solid stands!