wheel bearing

Passenger side wheel bearing is bad on my 91 4.0L manual, vac disconnect d 30. Went to the junk yard and picked up a hub assembly. Got it home and it is different then the one that is currently on my jeep. My father who pulled it said it was off a non disco. Is there a difference?? What wheel bearings can I use??? Any help will be appreciated

If you are going to go to the trouble to replace a the hub assembly then put a new one on it. They are only 95 bucks at oreilly's

They changed them sometime around '99 or '00 model year. Any one '98 or older should work on yours.