That's a small engine for a heavy truck. I am putting an OM617 5cyl turbo into a Ford Courier, using a Ford small block pattern 5speed. You can redrill the flywheel that goes with the transmission to fit the Mercedes engine, then figure out how thick of a plate you need and make your adapter.
There is a forum on 4btswaps.com specifically for the OM617 engine, there's been a few interesting swaps on there. I'll be posting my build thread there as time and money allow. I'll probably start really getting after it next month, I am wiring up an EJ22 swap in my car right now, so I don't have any time, money or space for the diesel swap right yet.