I put the lines into place and flared the end at the heater and then cut and flared the other line to fit the one in place. The second line was 3/16 to long so I had to take up the length with a bit more bend. I then disconnected the lines and went to the firewall end to flare them. I am using plastic industrial hydraulic line block clamps to hold the lines in place at the front and back. They worked very well to hold the oil lines from any movement once bolted in the back and structurally glued in with 2 bid in the front.