Hi

I just counted the splines on my shafts, for my 7.5" diff they are,
28 splines, length 50.4cm.
28 splines, length 46.4cm

for my 7" diff
25 splines. length 51.5cm.
25 splines, length 47.4cm.
outer flange 27 splines.

cheers

Kenny.