Hello Tom
If your bearings fail often, on low mileage, then there is the possibility that the person who did the first replacement made some mistakes pushing out the old bearing, maybe ovaled the hub, and consequently any bearing you put in there will fail.
However, I suppose you have already taken this into account. When you have the old bearing out it would be a good idea to measure the internal diameter of the hub all around with a vernier calipers to see if it is round and true.
Assuming it is round and true, then you have one problem less. What you will need to do is ensure you have new seals, that they are fitted properly, and that the bearing is packed with the proper grease before you fit the seals.
This brings up another important point; if you have already read a bit about the repeat failings, then you may be aware that the grease the bearings come packed with is not the correct fitment grease, it is for storage only to prevent rust. You must remove this packing grease and replace with the correct grade of grease. I can't remember what grade this is, but all you need do is ask for it when you are buying the bearings and seals, the shop will know.
Last point Tom, you can read up about the smaller NTN bearing, part numbers and all, on this thread:
http://www.subaru-svx.net/forum/showthread.php?t=27924
Have fun,
Joe
