I have had the Lewmar system for a number of years. I can't remember how long the tracks are but what I have is long enough to encompass a range of sails from the 155 to the # 3. I have 2 jib cars per side. You are more than welcome to check out my system anytime( although it's under the winter cover right now.)

:: I am going to upgrade to adjustable genoa leads. I
:: boujght the Lewmar ocean size 0 system (because it was
:: way cheaper than the harken) but the track only comes in
:: 7 ft lengths. The stock T track is around 8ft. I
:: orginally wanted to have a single curved track so I was
:: sure to be able to trim all my old sails. I have a #1,
:: #2, class jib, and a #4. Since it is looking as though I
:: am going to have to go to a split track on each side I
:: need to know where the #4 trims to? I have only used the
:: sail a few times and can;t remember how far back I moved
:: the lead from the #3 position. Any one have any idea?