This. The cradle where the crank is carried is exactly the same M103 or M104.

With the 92mm crank, it's not the bore to stoke ratio that's the issue. Hell, it's still relatively square at that bore/stroke. IMO, the dilemma is the pathetic rod/stroke ratio you'd have to run with that crank. You've only got 217.625mm to deal with on deck height. Take out the 46mm for the distance from centerline to centerline of the crank and 145mm for the standard 6cyl rod (sans 2.8 M104) and you're only dealing with 28.625mm for a compression height.

So... Long story short, you get a poor 1.57 rod/stroke ratio with a itty bitty compression height.

Oh yeah, you've also got a ton of weight to grind out of that crank to even get it into the ballpark of the other 6cyl gasser cranks.

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1993 190E 2.6 Sportline