Don't bother with the dust shields. IMO, they look weird and although cut down the dust a little, the oem pads will still make a mess. Go with the Axxis dustless pads. No dust for weeks. I've used them on 2 of my X5s and they work great.

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'06 X5 4.8is, TiAg/black, cold weather pkg., comfort seats
'07 750Li, TiAg/black, sport pkg.
'05 Ford F350 silver met./slate gray, Lariat, 6.0 PSD, CC, DRW, FX4