The entire seat bolts to the floor of the car.

The bottom part of the seat that contains the rails where the seat moves back and forth, and up and down, is called the base. It can be unbolted (difficult but do-able) from the "seat" part, that is the seatcovers/cushions and the metal frame+springbox in which they sit.

The w126 seat assembly can therefore be bolted to the w123 base. Why? Many more w126s came with leather, than did w123s (quite rare). Some people find any w126 seat more comfy than w123 ones, particularly early production w123 ones. The w126 rear seat also fits, so I am told (have not done any of this myself).

Yes, Jooseppi, people have installed entire w126 seats into w123s, but it is not easy due to issues of wiring up the power seats then either modifying the doors to accept the power seat controls or making some other sort of box to mount the controls into.

Generally much easier to just keep the w123 bases.

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Mac
2002 e320 4matic estate│1985 300d│1980 300td
Previous: 1979 & 1982 & 1983 300sd │ 1982 240d

“Let's take a drive into the middle of nowhere with a packet of Marlboro lights and talk about our lives.” ― Joseph Heller, Catch-22