G4 center shafts with UE diffs?

I am building a G4 with UE diffs and would like to use the standard drive cups. Does anybody know what the center dogbone lengths should be and where to get them?

Is there a cvd set available for the 3905? I looked on the MIP website and they list part #1495 as the center cvd set for the emaxx 3905, but the pic shows to shafts which are similar lengths which is incorrect. http://www.miponline.com/MIP/t-a10-emaxx-wide.html

Thanks in advance for your help.