Headset bearings

Im looking to replace the bearings on a Planet X RT58 carbon bike anyone know what size i need, the writing on the old bearings is unreadable. have emailed Planet X twice without success.
https://www.instagram.com/seanmcgrathphotography/
Planet X RT58
Cannondale CAAD 10 2012.
Pain.. Is weakness leaving the body.

HATING LIFE-CYCLES FROM 2011

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