[DfCas]

If the frame includes the split ring bearing seats you can use an FSA Orbit IS headset which does not include the split rings. My frame did not have the split rings so i bought the Look branded headset off Amazon which does invclude the split rings. It also included a metal crown race which i did not need because my fork has a molded crown race in the carbon. It also included a Look expander plug which did not fit my steerer tube because it has an oval interior shape. I used a Profile Gap Cap which fits from 1 inch up to 1 1/8.

The headset came from Mikes Bike in NB Canada. Took a while but no problem.
There is also a Cane Creek headset which does not include the split ring bearing seats.