odd noise - possibly exhaust hanger

[1981George]

Hello,
I wonder if anyone can advise. A noise has developed on my car a 2003 XC70. It sounds like it's coming from the rear and sounds wheel bearing-ish in the cabin and comes on from about 45mph upwards.
However the noise started suddenly during a motorway drive whereas previous wheel bearing noises have developed slowly.
I've lifted the car and given each wheel a wobble and nothing seems obviously amiss.

I had a quick look under the car to see if I could see anything, I was worried about the drive train but from what I see all of that was ok.
I did see the exhaust mount/hanger was broken, as shown in the photo. I wondered if that might be the cause of the noise? I may be grasping at straws though. But it looks to be a relatively easy and cheap part to replace so I thought I'd try that first.

Does anyone know the part number for the bit I need? Do I need just the bit that has corroded? Or the entire thing including both rubber mounts?

Many thanks
George