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seb1977-
Let me know if you want, they are these: https://www.lfgss.com/comments/13939721/
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I am almost 100% sure it is a 1 1/8 steerer.
In theory, a 381 is 1" (EC30 headset) and a 381i is 1⅛" (IS headset), but I couldn't find yours in the catalogue so it may be transitional.
amey
gbj_tester
ah mine are 1 1/8