Originally Posted by Ecurie Ecosse
It is an April 2003 UK car, so I am not sure if it came fitted with them, or they were upgraded.
If it was built in April 2003 it will have originally had the 305mm setup.
Production of GTAs with 305mm brakes stopped in Nov 2003, when production was restarted in Jan 2004 they were fitted with the 330mm setup.
So it will have been upgraded.