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@Departmentstoregirl
Hi
Read this paying special attention to pages 8 & 9
http://www.canecreek.com/manuals/Headset_Identification_and_SpecificationGuide.pdf
Using a borrowed engineers Caliper come up with an amswer.
Alternatively
Buy one of these (Alpina 1 1/8'' A-Head Integral Headset 36 x 45) from ebay £13.95 + P&P