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yoshy-
as long as the angle is right, it should be sweet
Well, it will centre the bearing properly. The other dimension is height, if the new one is different from the old one you may need to add/subtract shims to get the gap between the cover and the head tube right, but as long as it's above zero that's more a cosmetic issue than a functional one.
gbj_tester
From a functional point of view there are two flavours, 36° and 45°. You need to use the right one.