i just installed 16 in apes on my 2000 sportster.if your lines are not stock then you should measure the lines that are currently on the bike. set the apes on the bike how you want them.have someone hold them up for you in that position, and measure the remaining distance from the old cables, to the new height.give the dealer the measurements of the current lines then + whatever the difference is for the new handle bars.i find it easier to use a string to measure the curves and distance, then measure the string out for an accurate distance.if the lines are in fact stock, then just set your bars up and measure the distance from the stock lines and tell them +whatever the lenght is on stock. hope this helped out some. dont forget youll have to lenghthen the wiring on it too and if you plan on keeping front brakes youll have to extend that too.good luck