Sorry, I was talking X5 which seems to be a bit different and lots of the grid is exposed but I am still going to try to get the backing off to be able to work on it better. The guy on the link you posted is apparently repairing a place where the grid got rubbed through by the attaching bracket, not sure I'm going to be so lucky.

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1988 325is (purchased new) sold
2004 X5 3.0 2005 X3 2.5
2008 X5 3.0 (new to me)