..... but I recall looking into this....

I recall the cast arms were titanium, and were issued on the 500 and 560 models. Diesels and smaller engined cars had the stamped steel like the W123. My 85 500SEL euro car had these cast arms, so I don't think they are exclusive to the 86 and up redesign.

From what I could see, it appeared the cast arms (forged?) were interchangeable with the stamped steel.

I also recall this may involve a change in the way the disk caliper mounts, but it certainly looked like the cast W126 arms would xfer to the W123, if the different parts were also changed over.

Jim

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14 E250 BlueTEC black. 45k miles
95 E320 Cabriolet Emerald green 66k miles
94 E320 Cabriolet Emerald green 152k miles
85 300TD 4 spd man, euro bumpers and lights, 15" Pentas dark blue 274k miles