Well, I have a few questions about your question.
1) Why do you think the bearings need replaced? Just because the seal is leaking doesn't mean the bearing behind it is bad. The seal is a rubber lip that rides over the metal axle. Metal>rubber, so if anything is going to wear down and let the fluid out it's the rubber seal. Doesn't mean the bearing is shot.
2) Why buy New Old Stock when new new stock is available. You can buy new axle seals for for the 8.8 pretty much anywhere. Napa, Autozone, Advance, dealership, rockauto... I could keep listing places, but I don't want to.
As far as recommendations, I like to buy the seals at Napa. They are similar in quality to the Ford parts, but cost less.
If you are dead set on replacing those bearings, buy Timken. Same reason. Timken made the OEM bearings, but if you buy their name rather than Ford's you get a better price.