I just completed a front upgrade on my 2001 GSI. I used original Accent hubs (to keep 4x100 bolt pattern) pressed into 2000 Elantra/Tiburon knuckles. I used the calipers from Elantra/Tiburon, Hawk HP pads and rotors from 2001 Kia Sephia. The Kia rotors are almost dimensionally identical to Tibby rotors but have the 4x100 bolt pattern - the holes for the mounting screws even line up with the Accent hub. The only custom piece that I needed was to have a 1mm thick shim laser cut. This shim sits between the hub and the rotor as the Accent hub (at the mounting face) is not as thick as the Tibby or Kia and doesn't give enough clearance between the caliper and rotor. Also, added SS braided hoses front and rear.