The green cups have, on one side, a long shaft (the part that is hard to find/buy) attached to it. On the other side, is a green cup that has the short shaft attached to it (available at stores).
Both of these shafts are located inside the differential.
Hope this helps...
---JIM---
I guess popoplug (ppl) isn't a good a site as photobucket? The pics are gone from these links...Expired or Storage filled up?