Looks like the M120 crank bolt pattern in the back is the same as the M117/119. So a flywheel could be made to fit all three engines. The bellhousing bolt pattern is very different though, but the auto trans on the M120 comes with a detacheable bellhousing if I remember well. so an adaptor plate in the back to adapt a trans like a T5 for ex. would be feasible. throuw out bearing could be hydraulic. You may need a double clutch though.

We looked at that and the 722. bells for the M119 were WAY TOO DEEP with out any trans adaptor plate.. I think you can get a Tramec (spelling?) with different input shaft lengths, but it would have to be long, or the flywheel would have to stick out quite a bit, (more than I am comfortable with).. That plan was abandoned with the M119..

Now I do have a bell housing that CTH sent me from a 722 from a CLK (all I have in my notes) that is prefect to use as a manual bell housing and is why I thought it would be great for a M117/119, but the torque converters on the 119 must be huge..