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@nutsjesmoar
Really strange, as these are also 6401:
http://velobase.com/ViewComponent.aspx?ID=3180b43a-50da-4666-a719-34c44b0d2d4b&Enum=118
I had a pair (may still have them) that are also non aero. 6403 was shimano600, 6401 was tricolore.