Even a new gasket is no guarantee that your leaks will end. My experience is that replacement aftermarket gaskets aren't manufactured very well and do not fit the corners of the windshield.

I've had to reseal my 300D's windshield on the glass side of the gasket. I used 3M 08606 windshield sealer. DO a search on that item and you'll find my write-up.

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Never a dull moment at Berry Hill Farm.