Skyline, and if I am correct, the Skyline has the same hub and e-brake configuration as the Z's. I am currently fabbing a kit with Porsche 996 calipers (the same ones used in the SopTech kit) to work with the 15"F / 14"R rotors that Stoptech builds for the Syline. The trick is the caliper extension. The Skyline has a longer reach from the hub to the caliper due to it's larger diameter stock rotors, so the extensions would be too short for our Z32.