Hoping someone can help. Got a M111 engined W124, right hand drive.

I havea mystery vacuum pipe! It has come off the inlet manifold/throttle area somewhere. It lead down to the transmission. My gear shifts are very hard and clunky.
Problem is, I cannot see where it should go on the inlet/throttle. It became detached with a couple others as I replaced the manifold. I think the others are correct but can't be sure. I've got access to WIS but haven't been able to identify on the diagrams there.
It's the white one loose here:

On USA cars that vacuum line goes to the intake manifold directly under the large black air duct that goes to the throttle.

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it connect under the fail rail near cylinder no.3

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W123 - M111+Turbo