You will need 1 3/8" fuel hose. My local rubber hose supply has it in stock and it is straight with a thin metal rod running along the length of the tube. If memory serves me right it is about $10 per foot.
Call up a hydraulic supply/repair center and see if they by chance have it or know of a source.
You've probably already seen this
thread that is kinda the bible on this subject, but if not, it will give you some good info on tank replacement issues.