I am right now driving a non-Mercedes winter car with firmer seats than my w123, and have been a bit surprised by how much the seats improve the feel of my lower back. I have chronic lower and mid-back problems, and am 6 ft 4 ins tall. My w123 seats I would rate as good to very good... not like they are in need of a rebuild yet.

I am thinking specifically about Volvo seats, from the V70/XC70 line of models, 2001-up. These are in junkyards everywhere now... and they have insanely comfortable and back-friendly front seats. Volvo seats have had orthopedic design , to some extent, since the late 60s.

Anyone done something like this?

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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

Where there is a will there is a way

lots of guys swap SAAB 9000 seats in old VW

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)