Not trying to hijack this thread, but that is a very good question. Does anyone have a swap/compatibility list or know of one? While I do not have a W124, I would love to know if amps out of any other vehicles would work in my W123 (83 300D)

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2012 Mercedes ML350 Bluetec 91K (hers)
2005 Corvette 55K (fun car)
2002 VW Jetta TDI 231K (mine)
1998 Volvo S70 T5 Turbo 196K (kids)
1994 Ford F150 4WD 249K (firewood hauler)
1983 Mercedes 300D 376K (diesel commuter)