It looks like the yoke is attached by a small ball joint and should just pull apart like the throttle linkages on the engine, but I couldn't get it out. Probably need to tear down the brake booster completely to remove it. I'm going try sending the original booster in to be rebuilt. So I can confirm a late model, bigger w123 booster won't fit an early 123. The arm is the same length, the yoke is just different.

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1984 300D Turbo 200K