Just reorganized my spare parts... seems I have a few cups (5681) and locker output shafts (5678) but no gears to put in them. I found an inner diff gear set (5382X) but it has parts that are not needed like the I-bar, pin, and the two output shafts... I have lots of those from previous purchases of this set. So I went to eBay to see if anyone had just the little gears for sale... possibly even an upgraded version and ran across this:
This kit seems to have 4 of the little gears compared to two in 5382X:
But does anyone know if they are the same size??