Which Rotor/BB to order for new Power2Max?

I'm about to purchase my first power meter but am unsure of how it will all fit together.
I have a Felt AR with an Ultegra crankset on it. It's BB30, which Rotor says all of their products should fit.
I'm unsure of whether the 3d+ or 3d will fit the bottom bracket I have in it. The 3d+ is the 30mm spindle diameter and the 3d is the 24mm. The outside of my BB cups say FSA 24 Reducer.
Will the 3d+ 30mm spindle fit inside my current BB, will the 3d, or will both?
Thanks in advanced.
I have a Felt AR with an Ultegra crankset on it. It's BB30, which Rotor says all of their products should fit.
I'm unsure of whether the 3d+ or 3d will fit the bottom bracket I have in it. The 3d+ is the 30mm spindle diameter and the 3d is the 24mm. The outside of my BB cups say FSA 24 Reducer.
Will the 3d+ 30mm spindle fit inside my current BB, will the 3d, or will both?
Thanks in advanced.
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Visit the Hambini Website
I've a P2M on a Rotor 3D24 in my Reacto that has a BB30 BB. I found using adapters like the FSA ones is a waste of time and so purchased a BB386 to 24 BB from Velotech. Runs a lot smoother since.
http://www.velotechservices.co.uk/shop/ ... sp?cat=236