If you are going to repack the bearings then I would replace the seals just to be safe. You will more than likely bugger them up when you take them out so it's good to have another set on hand.
You can give Merlin a call at St. Charles Isuzu and he can get the seals right out to you. They're pretty inexpensive, from what I remember, so it's cheap insurance.
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong, it usually turns out to be impossible to get at or repair."
-Douglas Adams, Mostly Harmless