That's what holds the panel in place in the middle. When you pull the door by the handle to close it that's one support point. I would put it back. It slides on the metal part 8 exactly there part 14 shows up in the picture.

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4.8is 2004 imola red
4.8is 2005 Black on Black - DINAN/2 sold
4.4 2004 X5
2003 330xi
2008 328xi - sold
4.4 2000 X5 - sold