a 3/8 rubber hose fits over the factory hard lines.

IF it was me...... i would and am going to switch everything over to AN lines once we verify our new setup works and we wont ever have to worry about leaks or hose clamps. If you go with the ford cooler you can run an lines up to it and have a AN to hose barb fitting with a really short rubber line to the cooler.

SS line probably will be just as expensive as AN lines and is going to be a pain to bend. 6 AN is fairly cheap and is bendy.