I just disassembled my rear Formula hub and made some measurements.
the outside to outside measurement of the bearing seat shoulders is 78.25mm on my axle. The bearing surface on the axle is 9.99mm and the bearings are 8.0mm wide and 26.0mm outside diameter.
My axle measures 48.3mm from the bearing shoulder to the tip of the threading. I'm pretty sure my axles are longer than necessary to accomodate respacing. The hubs came as a wheelset laced to Mavic CXP-22s from Nashbar recently.