I've lost my locking lug nut key so I'm gonna have to get it removed by a tire shop, so once that is done, I'll pop my wheels off and try to get a better look at the mounts.

Looks like its ~$125 total for all 4.

I've read its not that difficult to drop the subframe and remove the bolt -- the hardest part is removing the old trashed subframe mount, and pressing the new one in. How did you do yours?

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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
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2003 Gray Mercedes ML350 - 122k