ML350 W163 Power Steering Fluid Leak

My 2003 ML350 W163 started leaking power steering fluid. It is the low pressure hose that is the problem - the end has perished where it joins the radiator. I was planning to use a generic hose (suitable for oil) to replace it, does anyone know what the internal diameter of the hose is please? [And length]. Many thanks.

 

W163 Low Pressure power steering hose

I've just taken a section out, and the internal diameter's 10mm if anyone's interested. The end of the hose where it joins the radiator was badly perished, so hoping that a new section with connectors should solve problem.

 

Thanks for the feedback, thats useful