How do I chose headset bearings for my bike.
Also what is the best way to model it for a carbon frame.
I can give more detail if that helps, Thanks Guys 
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The two most common IS headtube standards:
IS42/IS52:
This standard seems pretty similar across all brands. I use First Components as a reference because they post their documentation.
I use the d40k on our bikes:
IS52/52 for internal routing.
IS52/52 is a bit more all over the place. There seem to be different standards for the depth of the cups. I think ENVE’s specification is the safe bet:
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Thanks man also the bikes on your profile are really sick
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