I had to do a boot replacement on a w208 and ended up fracturing the synchromesh when I tried to remove the end. I had a spare axle from my w201 and was able to use the synchromesh from that one and everything worked out fine. Other than noting that the w208 axle was significantly thicker than the w201 shaft what would prevent the 2 from being interchangeable if you also replaced the rear wheel carrier assuming that the bolting points on the wheel carrier line up? I'm curious because there are tons of w124 around my area, but not so many w201 and if being able to swap out something like the axle with that of a part that was more plentiful then it would make things a bit easier. At some point I may need to completely redesign the center console of my 201 or start fabricating my own parts since a lot are NLA.

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1990 190E 3.0L