Brake line ?

[70GMCer]

Well, I found the source of my brake failure. Turns out I have a hole in the front right brake line just before it screws into the backing plate. My question is what is the difference between manual drum front brake lines and front power disk lines? I would like to replace this line with the correct bent line, but don't want to change it again, when I switch to disk brakes. Are the lines the same? Now, I'm talking about the steel lines, not the flex lines. If they are different, then maybe I'll try to make one up for now. Another question, are these lines that are sold pre-bent, are they easy to install?

steve