I'm sorry I don't have much specific information for you. I have done several auto to manual swaps including a few mercedes. I personally will not do such a swap unless I have access to a donor car, preferably within a few feet of the recipient. To do it right, there are just too many small bits that you don't think of until in the throes of the project.

Generally speaking transmissions interchange between engines within the same vehicle series. The bellhousing is part of the transmission.

Again, sorry I can't provide any help beyond generalities.

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2001 SLK 320 six speed manual
2014 Porsche Cayenne six speed manual

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