where can I find prebent/ ready made metal brake lines for a 97 ram sport 4x4?

the metal line runs along the drivers side frame rail to the rear of truck, and has rusted into and has started to leak.

strange thing is the truck frame and area where the line is , is rust free.

I had the same problem on my 97 Ram 1500 4x4. I bought a 25 ft roll of brake line from NAPA and the end fittings. You'll need a flairing tool and can make the bends by hand. Pre bent brake lines are not available, unless you take the rusted line to a brake shop and they will custom bend it for you. The one that runs along the frame to the rear axle is a pain because it is routed between the tank and the inside of the frame and held in with clips. To properly put the new brake line in the clips the gas tank almost needs to come down. I just didn't put mine back in the clips behind the tank. Check your other lines too. I replaced two others that looked real bad.