I did mine this way using a 1994 through 1999 Buick and Cadillac cup holder.

I can answer any questions.

https://www.youtube.com/watch?v=G5XbeLxrUe4&t=4s

That’s pretty cool

__________________
1993 e300
1995 e320
1994 e320
2006 s500 4matic
2004 Jeep wj overland
2001 Ducati 748
2004 Honda shadow aero

Installed a $15 marine cup holder from Amazon in my W126 in the center console, was an exact fit and works really well. I'm sure it could work with the W124 center console as well.

__________________
1979 Black on Black, 300CD (sold), 1990 Black 300SE, Silver 1989 Volvo 780, 1988 300CE (vanished by the hands of a girlfriend), 1992 300CE (Rescue).