Try the Wanted section - you basically want hubs off a Cupra, Toledo V5, or some of the TDi's ... not sure which ones though it's best to ask if the calipers were bolted onto the back of the hubs
Cupra R didn't get Brembo rears, but they are vented - the same discs as on the S3, TT 225 and Octavia vRS (only 2wd carriers are a straight forward fit - rears off the S3 or TT need 4mm spacers)