I live on the other side of the mountains from jelag and it's the same over here......any town over 1,000 or so people has at least one place making hydraulic hoses. Some have more than their fair share---Aberdeen for example.
Search around your home area for hydraulic repair shops. They will either be able to bend you up some new steel lines, replace them with hose, or steer you in the correct direction.
Fittings are readily available to adapt to whatever you want to do. You can Google for Parker Stores in your area to help narrow it down---Parker is a major brand of hydraulic hoses, fittings, and related materials.
Some people like to hack off (literally) the rotten parts and just use 'oil hose' with screw clamps in place......I don't do that, but it's a cheap fix. I prefer piping over hose, but proper hydraulic hoses and fittings will last a long time, probably longer than steel lines if you live in a rust-belt area, just watch the fittings.