Special purchase. A must have for these newer models.
They started using 18 mm hardware after 1996. Most wrench kits use to not even have an 18mm combination wrench - let alone a long one ( measures 11 inches long). If your working on the rear suspension, especially the control arm you will need an 18 mm and this extra length will really help with the torque needed to remove some of them!
18 mm Long Combination Wrench - 1998 to 2006 Rear Suspension Work
$8.25
SKU:
TUL-18MMCOMBO 
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Here it is! Your Missing 16mm and 18mm Sockets and Wrenches
These sizes are missing in most tool sets but are needed when working on newer models. See list below
It is really frustrating when you doing a job on your Benz and find it needs a 16mm or 18mm tool and you don't have it. Most of the older sets of wrenches and sockets did not include these two sizes. Just before and after 2000 Mercedes started using more of these size nuts and bolts.