The windshield gasket on my 300td is leaking, so I ordered an OEM seal. Looking at the replacement, do I have to remove the front of the headliner and A-piller trim? How are you supposed to get to the bottom lip of the gasket, since it's behind the dash?

I can't see how to gain access without removing the dash, but that seems ridiculous.

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1984 300TD -- summer daily driver
Many others that aren't Mercedes...