I replaced all of them via copper/nickel brake tubing. With a special tool the ends are "bend". Also a tool for bending the tubes themselfs helps. Need a bit of practice. Also a small tube cutter is required.
Most cumbersome is the tubeing at the brake main cylinder area, as you need serveral shorter heavily bend tubes. No space to goove. I did them by help of a vise and a steel tube of adequate diameter. Also the end of the one tube inside the motor area at the corner is hard to do as very narrow loop. It did work but was time consuming. Also you need a correct tool for the fittings as they are brass, an "open" ring wrench. The fittings most of them I replaced, issue there are different sizes to them. so you need to check.