I think what EODguy is saying is that there can be leakage where the stem of the stop meets the metal frame and/or that the stop might be set too high (extended, trying to get rid of a noisy hatch) not allowing good contact of the seal. There is a spring loaded replacement stop that works very nicely.

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1988 325is (purchased new) sold
2004 X5 3.0 2005 X3 2.5
2008 X5 3.0 (new to me)