Get hold of the suspect wheel and give it a solid shake, you will soon find out. Wheel bearings sound like a little steam train in the corner of your car, with little or no associated shudder. I first heard mine as a growl at really low speed (walking pace or less). Still drove it back from Apollo Bay to Melbourne then back to Adelaide before I worried about it, by then it had diagnosed itself.....
When you go to buy the part, Just Jap. Why buy two?
The manual RS4V has the extra tang with the bolt hole for the handbrake talk to the guys on the phone.
Call Joe Versace at Wheelworx for the fitment of your shiny new part. Be accommodating. Win.