Your dealer is an idiot.

Part #14 in this diagram. From the pix it appears it's the left side and your trim is black. If that's correct than p/n is 51-47-6-955-495



RealOEM.com * BMW E70N X5 35iX LATERAL TRUNK FLOOR TRIM PANEL

On RealOEM it's much simpler to search through stuff if you click on "Switch to image drill down"

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