I would like to add the memory function to at least the driver's seat in our 300TE (since both my wife and I drive it). It already has electric seats without memory. Unfortunately, if you study the wiring diagrams, it becomes evident that it is not just the switches on the doors that differ. The memory seats, in addition to motors, include potentiometers to give positional feedback signals to a box of electronics. Without memory, the electric seats simply have motors. The conversion would be an involved job, if at all possible.
107.023: 350SLC, 3-speed auto, icon gold, parchment MBtex (sold 2012 after 29 years ownership).
107.026: 500SLC, 4-speed auto, thistle green, green velour.
124.090: 300TE, 4-speed auto, arctic white, cream-beige MBtex.
201.028: 190E 2.3 Sportline, 5-speed manual, arctic white, blue leather.
201.028: 190E 2.3, 4-speed auto, blue-black, grey MBtex.
201.034: 190E 2.3-16, 5-speed manual, blue-black, black leather.