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According to a guy on another forum that frame comes with this headset:
IS42/28.6 | IS52/40
Upper bearing - IS42/28.6 | (OD:41.8 x ID:30.1 x H:8 x A:45°)
Lower bearing - IS52/40 | (OD:51.8 x ID:40 x H:8 x A:45°)So these two should do the job.
https://simplybearings.co.uk/shop/p185668/TH-073-ACB-36x45-deg-Headset-Bearing-40x51.8x8mm/product_info.html
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https://simplybearings.co.uk/shop/p20000207/ENDURO-608LLUMAXBO-Rubber-Sealed-Max-Type-Black-Oxide-Deep-Groove-Bearing-8x22x7mm/product_info.html
Is it the original headset? What bike is it?