Rek
Well-Known Member
It is part number 11 in this diagram, and here is a photo of the gasket.

Genuine BMW 51376740175 Gasket (Inc. 2.5CS, 2000C & 3.0CSL) | ML Performance EU Car Parts
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It has one thin side and a thicker one. There is a trimpiece which is against the top of the window with a join to the front piece just above the rear line of the door. On the left hand side this piece squeaks annoyingly sometimes. Is the thin piece meant to go behind that?
I have the gaskets but didn't fit them as it seems silly just to wedge them in not doing anything useful, so I didn't. Then the dreaded squeak surfaced.