Fuel Line Replacement, w123, 84' 300D

[runnersigh]

I need to replace a rusted out diesel hard line its heavily rusted and leaking in one spot and surely leaking soon in another. Not the injector lines, the ones running to the tank, both supply and return.
Any tips on the type of line I should use? I'm a diesel fuel line newbie! I've done many things on this car but not the hard fuel lines. Do I need a special bender or is there a type of line that bends easier?