I just had my annual 2 months ago, and just took vehicle in again today for replacement of the upper glove compartment lid that actually peeled away. I understand from my dealer that this is a common issue and the parts were back ordered for 3 months (they just got them in). In looking at the plastic seat trim, I doubt that it can be fixed unless they line the inside with felt; I've even checked the 09 X5 and X6, and they both have same cheap trim pieces. At this point, I'm really not too bothered with the missing piece since you really don't notice it unless you're anal like me and look under the seat ( just like to complain :-).

__________________
2012 328i Luxury, Jet Black/Saddle Brown (ED 8/9/12)
2012 X5 35i Sport Black Sapphire/Black/Dark Bamboo, Active Vent Seats, Premium Sound, Convenience, Soft Close Doors, Running Boards, BMW Apps
2009 335i Jet Black/Oyster
2007 X5 3.0 Black Sapphire/Beige (Sold)
2007 335iC Alpine White/Red (ED 11/15/06) (Sold)
2004 545ia Jet Black/Black (Retired)
2001 525ia Jet Black/Sand (Retired)
1995 540ia Jet Black/Black (Retired)
1992 325ia Jet Black/Gray (Retired)