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damn i found this diagram of ACB454530C-RS Generic, not sure if it's the same as ACB845H8 (MH-P08H8) though. the 5mm height before the outer chamfer starts and the 6.12mm distance between the chamfers seems to check out with my stock upper bearing. although looks can be deceiving i still want to believe from the pictures of the actual bearing that the 3mm chamfer covers more than 53% of the 5.65mm top section as in (outer diameter minus inner diameter) divided by 2. but i suppose there is no real reason that the stack height difference should necessarily follow the same pattern as the lower bearing.