Dunno about spacers, but the best setup is the OEM one.
I have the 298M and I live in Canada where we get a lot of everything. This kit is awesome, the handling, the grip are way ahead of what I had with my former vehicle (Trailblazer SS '09 with P255/50R20 Pirelli Scorpion Ice and Snow)
It's the recommended setup. Here is a slide from
http://www.xoutpost.com/bmw-sav-foru...ws-unreal.html and 2 pictures of my car