To obtain it, it must be purchased new from Citroën official services. There is an official website of PSA spare parts for classic vehicles that is currently undergoing maintenance, it will end in a few days and it will be possible to consult if they have that part.
New returns is a spare part that is in short supply on a large scale.
The best solution is to replicate this part in intermediate textile NBR, this material has even more useful life than the original hoses.
Many in the forum have opted for this option and we are very happy. With a lot of patience you can even achieve an aesthetic very close to the original.
The second-hand returns are all in poor condition, they are only worth it to extract the junctions and replicate it as I have told you before.