Cervelo R3 headset.......puzzled

All,
I have just bought a Cervelo R3 frame set to do up over the winter and want to replace the headset or bearings but have no idea what I need to buy.
The one currently fitted is an FSA IS2, but have searched the net and can't find anything the same.
The bottom bearing appears to be 1 3/8" and the top bearing 1 1/8".
If someone could help me out, I'd be forever greatful
I have just bought a Cervelo R3 frame set to do up over the winter and want to replace the headset or bearings but have no idea what I need to buy.
The one currently fitted is an FSA IS2, but have searched the net and can't find anything the same.
The bottom bearing appears to be 1 3/8" and the top bearing 1 1/8".
If someone could help me out, I'd be forever greatful
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http://www.evanscycles.com/products/m-p ... d-ec050673
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