Can anyone give me the part # and prices by any chance??? Is this a factory issued part only or can i get them from the aftermarket?

phd, I did a little bit of looking around and the normal places (Autozone, Advance, Napa) don't seem to carry what you are after. If you look at http://www.jaguarparts.com, they are selling the hub assembly for $170 (plus S&H) for each side. Of note, they also list the parts for the XK series under this listing. So, if you look on the site, pay special note of that. There is a big difference in price between the bearing for your S-Type and that for the XK series. Sorry, no part numbers are listed.

Dealership price is $369.72 a side, part # JAXR855936.