Are these Brembo GT equivalent?

[Aky]

Just noticed these Boxster Calipers on Ebay. Are these the same at the GT/Cupra R kit?

http://cgi.ebay.co.uk/Porsche-Brembo-911-993-Twin-Turbo-Rear-Brake-Calipers_W0QQitemZ130118411033QQihZ003QQcategoryZ23013QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

 

[claudefrog]

they are rears.. dont think they are the same as the front ones :S

 

[Aky]

Thats what I thought but then I read the bit about disc size and thickness and made me think they were similar.

Anyone know whether these would these be suitable for the S3? Or would I be best going for the Brembo GT kit?