Is it possible to do without destroying the seal? And the glass?
The defroster in my rear window does not work, but I have an old hatch that got damaged with a working defroster in the glass.
How should I start? If I have to buy a new seal, no big deal, just want to have the rear def. working before the snow hits.
Thanks,
-Geoff

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1985 300TD-euro 352,000 mi
1974 240D (1?)52,000 mi - has a new home now

It might be easier to repair the defroster. Auto parts stores sell kits for doing so.
If you really want to replace the glass, I suggest carefully cutting the old gasket. You'll need a new gasket no matter how you change out the glass.