I read through the above link and have a question.
With all the "other" cars I've owned, we have ALWAYS heated up the head light housing so soften up the adhesive and then just pulled the headlight cover off. I think only one person mentions it in the above link. Is the "heat" method not possible with Z4 headlights ?? It's a lot less destructive.
I'm thinking about it because I want the inner mirrored portion to be black.