If you want a fixed (non-adjustable) Adv screen you need the 2 inner and 2 outer mounts (picture in my wanted ad from earlier today) plus 4 bolts and a screen designed for a GSA.
If you want adjustability you need a Tobinator kit for a GSA (has extra spacers compared to the GS kit), the BMW GSA outer mounting plates (not the large inner mounts) and a GSA-compatible screen.