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and assumed it was threadless
Er.. yes it is.
Apologies, but I'm responsible for the tangent: not reading you original post properly and missing "threaded".
EC30 refers to an "external cup" and a head tube ID of "30.1mm".
Where are you looking? Wiggle have the Forty in an EC30 fitment
http://www.wiggle.co.uk/cane-creek-40-series-traditional-1-inch-headset/