There are multiple sections split with unions inline, for each rear brake line, that make up the rear system. You may not need that long a section, but you will need a proper line flaring kit and a double flare on the end of the lines being installed. 3/16 car sized line should be all that any car uses, as trucks are the only systems that I have worked on that required larger lines. This will be confirmed at the store when you go to buy a roll of line to work with, sold by the foot. Yes, they have prefab lines, but unless you are within one to two inches of overall length needed to repair said line and you can work with the unions still, I think a new custom line, front to back is best.
M10 x 1.0 thread on the flare nut fittings IIRC. Take the old ones off and match at the store.