I would price everything out before you buy any more parts. You might find its cheaper to get a whole axle depending on what is damaged. You have to ask yourself why did the pinion bearing fail? Was it something in the pumpkin? A crack, or an improper fit between the bearing race and the housing so the race was spinning too? Just be sure the reason the bearing failed can be tied to something other than the housing. If you do re-use the axle housing, I would give it a thorough cleaning with break cleaner, then soap and water, then I would take a magnet and glue it to the end of a long wooden dowel and run it up and down the tubes and get all the little bits out. You will be surprised what you pick up. I had to do this on my Ford 9ö when a wheel bearing went bad. Definitely replace all bearings and seals.

Sean