Good luck with the S13.
On a side note, I've got some new info about that Skyline/350z rotor upgrade that I linked. Apparently all the outer mounting ears for the front calipers were the same for the S13/14/Z32/etc, but the inner mounting ear position is different for each chassis, so for rotor upgrades with brackets that mount on the
inside, like those Skyline brakes, the brackets
do not line up with the rotor. So if you want to use the Skyline/350z rotors you'll need to make your own bracket for it to work.