Alfa romeo 159 2.4 diesel - Injector rail replacement

[Marc000000]

Hi,

One of the connections of the injector rail has been threaded on my alfa 159 diesel 2.4L. It will need to be replaced.
Do I also need to replace the 5 little pipes to the injectors, or will the old tubes still form a seal with the replacement rail?
Is it okay to pick up a secondhand rail or is it advisable to purchase new.
Look forward to aa response.
Regards,
Marc