The only difference in our kits for the 2006-2015 LT-Z400’s is that they have 12mm diameter tie rod threads instead of 10mm threads that are on earlier models.
Stock brake lines should be long enough to install the +4.5” kit if you disconnect the intermediate brake line support on the a-arms to provide more slack in the lines, but they will probably not be long enough for the +6.0” kit. You may also need to disconnect and reroute the brake lines over the top frame tube to allow even more slack.
Diamond J Customs does sell brake lines if you would prefer to use extended-length stainless steel braided brake lines with your widening kit.
You can find more general information about our widening kits under the Front Widening Kits menu from the Home Page.
Instructions Download: Z400_SWID_tri-fold_instr