Hey mate i understand your confusion as iam in the same boat hope i can shed some light for you.
As far as i can understand the S2 RS models front brake rotors are completely different to the RS4 and any other model for that matter, but i believe pads are the same.
You can get pads and rotors from nissan dealers, but your best bet would be from a website like Greenline.jp, RHDjapan, Nengun etc
eg. can get Dixcel rotors from Greenline for approx $370 delivered but i recommend you email them first to ensure they can supply you with the right parts, i have found that they are quite helpfull provided you give them the right information
I highly recommend getting your rotors on car machined if they have enough metal left, a much cheaper option then replacing.
As for pads they are a bit easier as they are the same as the RS4 and can be sourced locally. I got my set from GSL Rallysport in bris for $99 delivered. Not a bad pad, good feel and temp range but very and i mean VERY dusty. Talk to them i believe they have a few options for pads now.
GSL Rallysport can be found on this website see link below.
http://www.skylinesaustralia.com/forums/gs...port-m9479.html
Hope this all makes sense and helps you out, if any one else has information please feel free to share and correct me!
Regards
Chris