Headset for Giant TCR Advanced?

Could anyone help me find a replacement headset for a Giant TCR Advanced 3?
I'm told it's 2011, but could possibly be older. It has external cables and a 1 1/8 to 1 1/4 tapered head tube
Thanks
I'm told it's 2011, but could possibly be older. It has external cables and a 1 1/8 to 1 1/4 tapered head tube
Thanks
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I'm pretty sure its an overdrive system, however my headset is flat, whereas most websites picture a conical top piece.
The lower bearing is th industries 1-1/4 ACB 45 x 45