Complete your engine swap before you start pawning off electricals and anything in front of the steering column. By all means part out the cosmetics to w140 owners on benzworld or whatever, but the mechanicals - I would be mindful of what you are swapping over.
If that w140 has a 722.5 then toss it. trust me when I say the 722.5 is not a transmission you want behind any engine. especially if you want to use reverse gear one day.
1987 201.034 - € spec 5sp. Blauschwarz- Hermann.
1992 124.051 - 6sp man. Iceblau - Gretel
1992 124.090 - 4sp auto Malachit Grün - Beatrix
1987 107.048 - 4sp auto Signalrot - Stella
2012 212.074 - 7sp mct-speedshift Diamantweiß - Klaus
numerous other non-MB's
MB exit lounge: 1989 201.035, 1987 201.029, 1987 126.039, 1972 107.023