yeah jake. i have just finished the conversion myself and you need to machine or file down the front of the hub so that the small hole of the rotor fits over and also you need to machine/grind the back part of the hub where the studs are to allow that to fit into the discs recess (dish shape). longer studs (i used the S13 ones) are required because now you have about 10mm of discs sitting between the wheel and the hub. which means you gain about 20mm in track width at the front. which means you may need to get the guards flared if you havent already.