Hi Sorry for the delay,
If you go into your dealers and ask for the 07 rear doughnut they will sell that separate from the propshaft, don't know why they won't for the 08? The part is exactly the same and it fixed my low pitch rumble.
There should be some play in the rubber mount inside the metal bush, mine had seized solid with no play at all.
I would bet it is the rear one as it seems to be a common fault.
If you go into your dealers and ask for the 07 rear doughnut they will sell that separate from the propshaft, don't know why they won't for the 08? The part is exactly the same and it fixed my low pitch rumble.
There should be some play in the rubber mount inside the metal bush, mine had seized solid with no play at all.
I would bet it is the rear one as it seems to be a common fault.