Double flare......yes..........stainless is not the easiest stuff to work with.

Make the old new line usable ( longer) .......add a compression joint in a straight section.

Eastwood has a double flare tool that makes life easy:

http://www.eastwood.com/professional-brake-tubing-flaring-tool.html

Nickel copper line makes life even easier:

http://www.jegs.com/p/JEGS-Performa...ckel-Copper-Brake-Lines/2111534/10002/-1