Been there done that! If you want to get the sunshades out you need to remove the entire sunroof assembly and disassemble it on a bench. It is virtually impossible to disassemble the sunroof in place. It is a difficult enough task due to the lack of available information on how to disassemble and reassemble the unit.

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2008 X3 3.0si My DD
2005 X5 4.4i Better Half's DD