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Headset Bearings info please.

Slowly fixing bike part by part but I have it a problem with replacement with headset bearings. The steering was very gritty so I have took it apart as per YouTube videos and removed both top and bottom bearings. The top bearing was not very good and the bottom bearing was simply in bits, trouble is I cannot find any marking on bearings whatsoever to order replacement parts and I am stuck. The bike is a BMC Streatracer SR02 it says headset type is 45x45 but when I measure them photo attached they are not 45mm across ?. The forks are bmc straightedge se48 carbon legs with alloy steerer tube. Any help would be great with a link to Wiggle or chain reaction ever better, many thanks.


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