I cant believe there isnt someone on this forum thats come up with a solution for this besides AN lines.
As quoted making lines out of cunifer would be the best way to get something easy to cut/flair/shape to make your cooler lines for the TH400. Make them your way so you can keep a nice clean set of lines. Use the old lines as a pattern until you get so close to the transmission then make the adjustment to fit the TH400. I'd also suggest brass nuts over steel ones.using cunifer tubing