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@Ced
I hate electronic callipers, vernier gauge will do it, good idea, however since the clamp is integrated, it's hard to measure above the start of the slit. I think I'll just call bob Jackson, see what they spec, they don't provide the info on the site.
Spacers will be carbon, stem probably is likely to be black considering second hand part availability but we'll see, but I guess traditionally the headset was always part of the groupset so makes sense.