I won't be of much help, but I'm willing to take a stab at it.
On rear 60's, if I remember correctly, there are several spline counts out there. Of course mo splines, mo better. /forums/images/graemlins/thumb.gif When inspecting one to buy, pull the shaft and count. I'm pretty sure the 35 splines are hard to find.
On the D60F, about the only thing that comes to mind is that prior to a certain year, the shafts were necked down... but the year escapes me... prior to 85 maybe ??? /forums/images/graemlins/dunno.gif /forums/images/graemlins/1zhelp.gif
Not much help, but maybe a start.... TTT anyway. /forums/images/graemlins/waytogo.gif