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Yeah it's Cannondale bearing covers, but I put them in, which means they must have come with Cannondale bearings. Found the email. They're basically Cannondale version of these https://www.bike24.com/p230408.html Looks like they don't do the kit any more but the bearings will surely be available.
Actually I've just found a bag of Cannondale crank tools and it has bearings in it. I reckon I bought the cranks with a BB and then bought another axle kit to reduce the Q-factor. Presumably the bearings are the same so looks like I might be able to swap them.
Wait, there's a BB with something written on it? BB30 is just bearings twatted in the frame, is it just Cannondale bearing covers?