Nope...don't get that one...won't work.

First, lets address what Cervelo's BBright is. BBright is PF30 but 11mm longer at 79mm wide. Will your Ultegra 6700 crank fit? Yup.
How do you get it to mount?
If you just have the R3 frameset with no extra bushings...you need some. Basically you have a 79mm wide BB shell. PF30 cups are pushed into each side of the shell. Then press in a BB30 bearing into each PF30 composite (Delrin) cup. Now you have to fit your 24mm spindle diameter to the BB30 bearing ID. This 6mm diameter difference is taken up with spacers commonly used to adapt Shimano cranks to BB30 but with different thickness because BBright is 11mm wider than BB/PF30. If you have any question about what spacers, send an email to Wheel Manufacturing...their site shows many applications but asking their customer service will take the guess work out.

That is all there is to it. Your frame may already have std PF30 bushings pressed in with BB30 bearings pressed into respective sides. If this is the case, then all you need are the Wheel Manufacturing Adapters.

Mounting a DA or Ultegra crank to a Cervelo with BBright is a popular practice. Btw, a BB30 crank that has the same diameter spindle as the bearings that go in your frame will NOT mount to your frame...it is too short.

HTH.