A wrench fits there nicely - and a german ELORA brand wrench fits there perfectly - its box end has a very strange offset that makes getting that bolt easy - almost as if it was made for it.

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)