Easiest way is take the section you need to replace to your local parts store and get the proper size/length of line. Bend it yourself and if you're not comfortable cutting the length and re-flaring the end, I've taken lines to the auto repair shop and they did it for a couple $$. Heck the parts store might do it for you. Then replace the line on the truck and bleed! On my 49 1/2T the line just goes from the master under the engine to a T union on the pass side frame rail. Pre bend lines can be more trouble/cost than they're worth.

Ed