I just added an Apple 512GB SSD out of a 2012 15" rMBP. I got the drive and the converter from ebay. Use this to convert to SATA3 Before installing I used a USB3 Thumbdrive with Lion installed to boot. I then used drive utility to restore the OS to the new SSD. The SSD was mounted on a SATA to Thunderbolt adapter. Everything should now be copied to the SSD. Once installed I booted from the SSD. When everything looked good I cleared off the org 1TB disk for additionally storage.