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I believe that the M102, M103 and M104 bellhousing patterns are the same, meaning you can mount a 5-speed transmission from a 300E or 190E onto your M104.
However, The flywheel is going to be a problem for you. The flywheels and driven plates (for the automatic) have large metal ridges that trigger a sensor for the ignition system. The ridge positions are different across motors.
There's a long thread in the Performance section were we've been actively discussing manual transmission swaps, both in regard to the bellhousing patterns, the flywheel setup.
We need photos (better yet, samples) of flywheels and driven plates from various motors.
-CTH
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