turbo FIP hose type

I need to replace the hose that goes from my 300tdi turbo to the FIP. Rather than buying the pre-made one for £30, can anybody tell me the spec of the hose? I watched a video on youtube about using the hard plastic pipe and heating it to push over the banjo fittings, but what size / spec is the pipe?

I'll probably need to do the turbo waste gate pipe too. Its a rubber pipe just now. Again, anybody know what spec?

Thanks