Mario, thanks for the effort, I must admid I had slightly forgotten this thread .
I do notice from your pic's and measurements I took from 2 other sets of driveshafts (both also from manuals with big diffs) that there's quite a lot of difference in the uncompressed condition.
However, after buying 2 sets from big diffs and comparing them to my own small diff shafts in a fully compressed state I found out there actually is no difference, so there should be no problem in fitting small diff shafts in big diff setups. (As some members mentioned)
Btw, good progress on your supra , in for pic's when the diff and shaft's are fitted.