Chosen Solution

can I put a 2TB hybrid SSD into an early 2011 macbook pro? 2.66Ghz w/ Yosemite OS X.

Your system has a SATA III (6.0 Gb/s) HD interface which can support a 2.5" 7mm high drive. So you do need to be careful the drive is not to high. The Seagate SSHD: Seagate FireCuda is a good choice or if you are looking for a SSD drive the Samsung 850 EVO is also possible.