http://www.amazon.co.uk/Akasa-Stor-...IS30/ref=sr_1_4?ie=UTF8&qid=1354805279&sr=8-4
This should suffice.
Also I bet with the 2012 cMBP the Optibay SATA connection will be SATAIII since it's Ivy Bridge. (2011 was SATAII for the optibay and SATAIII for the main port).
A word of advice...put the SSD in the main slot and install OS X on that then move the HDD to the optibay and use it a storage for large media, etc.
This should suffice.
Also I bet with the 2012 cMBP the Optibay SATA connection will be SATAIII since it's Ivy Bridge. (2011 was SATAII for the optibay and SATAIII for the main port).
A word of advice...put the SSD in the main slot and install OS X on that then move the HDD to the optibay and use it a storage for large media, etc.