Ok, so I got the flywheel for the r150.  Now it's time to build a balancing jig to match it to the original benz.  The bellhousing will need to be cut back about 1" and I will make a new mounting flange drilled for the mercedes bolt pattern.  The flange will be welded to the trimmed bellhousing.  The bolt holes for the toyota flywheel are a slightly smaller spacing and the center hole is about 3mm too small.  I need to find a machine shop to make these corrections before I balance it.  So if anyone knows of a machinist in the Portland area that would do this let me know.  I am also looking for the r150 transmission.