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@Sumo
The headset is an integrated one. There's 2 types of integrated headset, 36/45 and 45/45, the numbers are the angles on the bearings top/bottom. I believe the Ribble uses the Campagnolo version which is the 45/45 one. So you need something like this:
http://www.chainreactioncycles.com/ritchey-comp-drop-in-integrated-headset/rp-prod39378