This is a Technical Journal: New Remote Controls and Shells for XC90/S90 The remote control shell fastening concept has been changed to solve issues with the shells coming loose. Remote controls and shells of the new design are not compatible with remote controls and shells of old design, and vice versa If a remote control or shell of the old design is replaced with a new part of the new design, then both the remote control and shell needs to be changed to the new design.