[_paralyzed_]

for instance I used an lst center cvd and a hyper 8.5 front shaft to put a center diff in the last e-maxx I built.

I needed around a 100mm shaft, so I got into the r/c section of ebay and just searched 100mm. If nothing matched then I search 99mm, then 101mm. (you usually have a few mm's to play with)

I always end up finding a shaft that will work. If you absolutely can't find a shaft Rc-Monster Mike can make custom length shafts.