If you are really building a serious Rig, then your brake system NEEDS to be improved. Factory wheel cylinders just don't provide the stopping power that is needed to stop. One of the biggest hassles is adapting the Monte Carlo Caliper to you factory brake plumbing. These lines solve that problems. In addition we have them stainless steel braided. This braiding reduces bulge for crisper brake action. One end is 10 mm to fit in your factory T connector and the other is a banjo style fitting for the Monte Carlo Caliper. Most all kits use this caliper. Look at the line drawing. These lines are the gray ones (2). These lines fit Land Cruiser, Mini's and 4 Runner that have done this conversion.