Continued-
Speaking of the axles, you would need to custom combine the 8.8 inner axle stub and Mercedes outer hub stub.
8.8 axles
Inner axle stub
Visually, Ford 8.8 appears to be a bit wider in between the axles than the Mercedes pumpkin.
Thunderbird assembly
The axle shafts, depending on which one you will use, might need to be shortened for use on a w123. W126 bodies may be able to use the shorter w115/w123 axle shaft to make it work. (but as I stated above with the differential positioning, the longer shaft might be needed to work on a non-90 degree layout.)
If stock Annular axles are the correct length, then maybe using modified axle flanges from the front F150 8.8 differential can be made to bolt with the Mercedes Annular axles.
F150/Expedition front axle flange
This might be a sacrilege to put a Ford product in a Mercedes to some, but it is a possible solution to the Mercedes LSD dilemma; hopefully it will give you some ideas.
.