They don't make a Bilstein HD set for the V8 124s. Promise. You have to mix and match. The new owner of my 400E mixed and matched Sachs and B-HDs on the 400E, and it rides like a charm. Same with my 129Sl. Bilstein HDs in the back, Sachs up front. I know for a fact that's the factory-spec on the SLs of that era. Prob the same for the 124 V8s

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former: 83 300D, 97 C230, 93 400E

current: 08 C300 Luxury , 92 500SL