I replaced the front shocks on my 280ce with standard Bilstein's, rather disappointing, the Bilstein's on my 300cd are much stiffer, much more satisfying handling and smooth enough ride. There are stiffer Bilstein's available for these chassis. One other thought, find a W123 "Touring", i.e. "wagon" parts car, "re-purpose" the front swaybar, it's larger diameter...

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Dedicated to the preservation of antique Mercedes Benz's, one rusty ol' bucket of bolts at a time!