Came across this today, ( It would help my M104 to manual trans effort even though the kit is for an auto trans.

http://www.transmissionadapters.com/Mercedes%20diesel.htm


Chevy 700R4 auto trans to Mercedes
We also have a kit for the Following Mercedes diesel engines:
OM601 / OM602 / OM603 / OM604 / OM605 / OM606

These 4, 5, and 6 cylinder engines have a common bolt pattern on the block.
There are NO modifications to either the block or the transmission case, and is easily bolted on at home. This kit retains the original flexplate and starter.
The kit consists of the following items:

• 1 inch thick aluminum adapter plate
• Bolt set
• Mini-high torque starter
• Flexplate
• Crank adapter

All machined parts are American made. The cost is $725.00

Bendtsen’s Transmission Adapters 763 767 4480
13603 Johnson St NE, Ham Lake, MN.