The braided stainless flexible lines are -03AN and the hard lines are 3/16
If you would like to go the extra mile, look for 304 stainless steel tubing that is seamless and has a wall thickness of.028 with this tube you may use a single 37-degree flare with a tube sleeve and tube nut assembly, looks very nice.You will find it all at
www.GODMANHIPERF.COM Hope this helps. Rod