[Engine] Injector Seals Replacement

[SolentCarAudio]

Hi,

I have searched and cannot find anything on replacement of injector seals. The job sounds easy enough providing carbon deposits are not too bad.

However I have two questions:

What torque do the pipes need to be tightened to?
I already have a torque wrench, where can I buy the tool which allows a torque wrench to be used to tighten the pipes to the correct torque settings?

Engine is DV6TED4 1.6HDi and vehicle year is 2007

Any help would be appreciated.