Found a good deal on Amazon for 1410 series Spicer half shafts for scratchbuild number 2, the part numbers are:
Flange yoke: Spicer 3-2-159
U joint: spicer 5-160x
Yoke shaft: spicer 3-82-268x
Slip yoke: spicer 3-3-118kx
My new build isn't at a point where I can check these parts so they may not be right.
SB