If you are doing it yourself copper brake line is easier to work with both for flaring the ends and bending to the required shape, copper will work easier if its heatred to cherry red then quenched in water, that softens the metal and aids forming the flares and bending the pipe. Worth investing in a decent flaring tool. I was lucky with my hard lines emerging from the plastic channel at the rear nearside, they cleaned up and were in good order, a coat of black paint had them like new. I did however replace the two flex lines with the hard line between them as that was well rusty. I used stainless flex lines 2 at each rear wheel and singles on the front. You can get siongles of the required length but I wanted to retain the stock securing clips for the rear pipe rout, single length replacement will require the use of cable ties to secure it. I sourced my hoses via ebay ket of 6 hoses circa £80.