It's hard to tell but it looks like this may be the trim piece you need:
41347193222 $223.00
I took this off RealOEM. Here's a link:
http://www.realoem.com/bmw/showparts...97&hg=41&fg=25
Jim
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128i Convertible, MT, Alpine White, Black Top, Taupe Leatherette, Walnut, Sport
Ordered 5/22/09, Completed 6/4/09, At Port 6/9/09, On the Georgia Highway 6/13/09, Ship Arrived Charleston 6/24/09 at 10pm, PCD 7/21/09