I just finished doing this with the Arnott bag for my right rear. Pretty simple and straightforward. The only gripe I had was lining up the tabs at the top of the bag for the mounting location.

Just a note to those with Adaptive Drive: I took off the negative of the battery as I didn't know where the fuse box was. After reconnecting and getting everything sorted, the 4x4 and Adaptive Drive OFF errors came on. I suspect it'll go away after a few power cycles as it usually does when I get those errors due to work.