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IS41, the OEM one is FSA. There are a few variations in bearing thickness for the cartridges, so measure and check. The upper isn't a problem because you can just shim it and get the right cover depth from me if necessary, but the lower needs to be the same height from the bottom of the crown race to the top of the bearing as the OEM one, or you get either a big gap between fork crown and frame or worse no gap at all.
gbj_tester
@ewanmac
@gbj_tester can you remind me what headset I need for the old style (2007) p2c? After 13 years of neglect mine is totally seized but google sent me to some radically unhelpful American forums.