Peaty -
Looking up under the seat, everything appears (operative word) to bolt on. Not having an '06 to compare to, I think it might be possible to attach the necessary parts. Of course, that assumes that the motors, wiring, and seat frame are the same. I tried to get some pics, but the stuff was just too far up under the seat to get a good view with a camera.
The best bet would be to get an '06 & an '07 side-by-side and compare.
BTW, my dealer had no B9s with the retractable cargo cover. My '07 has 2 connectors right behind the 2nd seat (on each side) that are covered by a snap-on plastic piece. Under that there is a place that the cover fits into. You can remove the cover and replace the piece if you do not want the cover in the vehicle or just retract it. Hope this helps.