Just thought I'd come back to the thread I started to bring closure to the question. Somoene's bound to need this information in the future and it will be here for them.
My mechanic just told me that the front and rear wheel bearings on the MY97 are the same even though the part numbers may be different.
So, if you find that some sellers are charging more for the rears than the fronts, just buy four for the lower price.
If you have another MY, do check though as it seems to be different in younger cars.