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@miro_o
Make sure your BB spindle and crank have the same kind of square taper (either JIS/Shmiano or ISO/Campag). If your running JIS BB spndle and ISO cranks the arm will sit further out. Fit all that and measure it with some measuring calipers.
Move onto the hub. Get a 120 track hub with a long enough axle (time to call a shop who stocks a few). Then get some spacers and you'll be fine.
You don't need any special high-science or one of these...
http://www.parklandscientific.com/VetDopProbeSphygHS-2.gif