If you look in the W126 FSM there are different specs for ride height and castor for vehicles that were sold to countries with poor road surfaces.

I don't think, however, there are many different suspension parts other than spring length and the height of the rubber spring mounts.

The rubber spring mounts on a W123 come with 1, 2, 3, nubs for the front and 1, 2, 3, 4 nubs for the rear. You can find the specs for these mounts on www.febi.com (for example)

For spring specifications there are several threads on this forum.

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1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



Don't leave that there - I'll take it to bits!