The hub/spindle are the same on all the FWD Mk4s I think, but the AWD ones are slightly different. The GTI didn't get substantially bigger front rotors, you'd need to go to either TT/Bora V6 4Motion (312mm) for a decent upgrade, or the R32 option (334mm) though they require either OEM 17" or OEM/3rd party 18" wheels, and even then you have to worry about offset and internal clearance, not to mention that they go for ~$1000 a pop.
You may need an adapter (a spacer, very small, quite cheap) to fit any of those to standard FWD setup.
I have a set calipers/carriers to suit the 312mm front rotors that came on the TT/Bora V6 4Motion if you're interested - selling for $300. I have the old rotors too if want them, though for the price (and considering the cost to freight them from Sydney) I'd suggest just grabbing a new set (mine would be close to minimum thickness).
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