Don't put anything in place of broken missing part. The wedge/shim goes on the other side. Steel zip tie needs minor tweak to double wrap. Single wrap might work ok.

https://www.icloud.com/sharedalbum/#B0S5p3ich2Nfrc

Look at the photo album turn on captions the first couple pictures itt shows the modification needed to double wrap the steel zip tie.

It also shows step by step how to fix.. of course left vs. right side is mirror image.

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2011 E70 • N55 (me)
2012 E70 • N63 (wife)