You are soooooo right serious_lee. I bought a brake line from O'Reilleys today for my M-37. Unfortunately, they only had 72" length and I wanted 84". I improvised and used a different routing, and today I took my M-37 out for a ride for the fist time in about six months. What Joy.
Just buy the ones made up already with the nuts on them, and pre-flanged. If there is the slightest burr in the ones you flange yourself, it might leak. So much easier to buy them already done, and just get a tubing bender, or roll it over back and forth across a dog food can or something for bending. Easy stuff, and cheap as the stuff you buy when you get all the parts and tools.