The point I'm making is that those numbers are still within the range (on the outside, but still there) of the Merc 6 speed. So all that work to adapt would be pointless?

You're correct the Nissan box is not a removable bellhousing, but you're going to have to make an adapter plate anyway, either from a removable M104 auto housing or to the block itself.

The V160 imo is way over-priced. For that price you can get a Viper T56 with a bunch of work done to it or either nissan or toyota box in whatever ratio and gear engagement setup you wish. However I'm suggesting those boxes, because I plan on exceeding the amount of torque and power that the MB 6speed, a dual mass fly, or any of the lil' roadster boxes.

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1993 190E 2.6 Sportline