it's a hub needed bud, not sure you could buy just the bearing, really good to do, remove rear caliper and brake pads, and the brake disc can come off, then remove the hub dust cap, then undo the spline hub bolt and the hub can come off, that spline hub bolt is a specialist tool though and really tight, once you've got the hub off, have a close look at the abs sensor and make sure the inner rubber part of the hub hasn't been fowling the sensor and wearing it away (common problem)then re-fit the new hub, last one i got was about £35.00 from dmfx in darlington.