Unlikely that it is unified, as 7/16", a standard tube nut size, equals 11.11 mm. I have just had a job & half changing the flexibles on my Rover 45 . Ended up cutting the pipes as the tube nuts wouldn't undo. Fortunately it was the front & it was easy to run new rigid's across inside the engine bay , through the inner wings.
Rears on my Discovery Land Rover , had the same issue and ended fitting new short sections of the rigid as you suggest.
Last edited by RoverP480; 1st June 2020 at 09:51..
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