The length of the individual lines makes no difference. Do understand, you can buy additional line and related fittings from your local automotive parts house. Simply stated, with your existing tubing, run which ever line you want. I suggest the longest first. Then run the second, and if necessary purchase additional line. Do keep in mind, the more connections you have, the more likely you will have leaks. This is not earth shattering, but should be considered. I will also add, that you can buy several feet of tubing for the cost of one fitting.