I am looking for a replacement for my Sachs 7000 rear hub and have been told that these were manufactured by Mavic - and possibly the same as a 500 or 501.
Here are some pictures and measurements of the axle.
142mm long
Bearing seat diameter is 10mm
Hub section diameter ~11.5m.
The lengths of each section in millimetres are:
20 (left thread) > 13 (bearing seat) > 59 > 13 (bearing seat) > 37 (unthreaded/right thread)