W123 Fuel Line Replacements for Bio-Diesel?

I've looked, but can't seem to find the definitive answers.
Surely someone knows out there...
Please, what are the correct sizes for the hoses that must be replaced for B100 use?
I have seen 8mm ID, for some...
What are the clear lines at the IP and filter called?
Are they 8mm?
Can the stock MBZ replacements handle bio-diesel, especially the injector lines?
Is Viton the only good option?
Where does one find it?
Thanks!




'80 300CD,
non-turbo, but GOES!!!