I left mine off. I was having problems with the button pressing itself when the rubber cover was installed. I took it off to investigate and the problem went away.
I think you'd have to go to a mini yard to find the part. You can find the build date from the Vin if you have a smart phone with you.
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2011 E70 • N55 (me)
2012 E70 • N63 (wife)
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