Need power supply specs for the My Book Thunderbolt Duo 6TB

I moved a year ago and just now am setting up my Apple iMac with my backup drive. It seems that I have lost the power brick to my WD My Book Thunderbolt Duo 6TB drive listed above. I have a large supply of power bricks in a bin, but I need to know what it looks like with any identifying labels and power info, i.e., watts/amps/etc. If there is a name on the brick or you have a photo of yours, I will be grateful and back in service in no time!
Thx, Pam