I've never seen one in the e53...but the IR (infrared) comfort windshields in the e38 & e39 have a cut out at the top and at the bottom.

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• 2015 f06 650ix GC (Moonstone exterior/Cohiba brown Merino Leather interior)
• 2014 f15 X5 50i (Space Gray exterior/Mocha Nappa Leather interior)