It will be a rusted bracket at the bottom of teh glass that bolts back through the shell.
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I've a sunroof model and have had a glass out respray
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- my bracket had rusted through moisture ingress.
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It is bonded in and then has 3-4
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(can't remember how many) bolts on brackets pulling it in tight.
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I took my whole gutter off
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- not sure if that is entirely necessary though.
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