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@jsabine
Sure it's discontinued? The Velocity website seems to have it available in a number of versions (eg http://store.velocityusa.com/p/aerohead-700c-nonmsw?pp=12&pp=12), though to be fair I didn't look for a UK supplier.
Various sources suggest that an Open Pro has an ERD between 602 and 605mm, with at least one claiming to have measured it at 603mm - this would be more than close enough to work fine. (And a Rigida Chrina is a straight swap for an Open Pro, and a lot cheaper ...)