hello,
  quickie question if anyone knows? 
 Is, gennerally speaking the upgraded aftermarket clutch slave cylinder for the 996 model and up, exactly the same even on the 848 1098 1198. i ask as i might swap over the 1198 oem standard  (when it arrives end of next week) with the old one on the 996? 
 currently it is a evoluzione   
http://evoluzione.net/photos/90041_42_43.jpg   the web site does seem to suggest but mentions bore sizes of 28mm or 30mm  
 thanks for checking