The w123 backs and bases are interchangable in terms of bolting to each other, in terms of sedans and wagons. Not sure if the Coupe seats are the same.

The seat cushions and covers don't match, however, in terms of shape, contours and pattern/pleats.

There are three or four styles. I always thought three, but someone corrected me on a thread a few months ago.

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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