Ok, these are the two main shafts side by side. Notice that the new one has an oiling galley for lubricating the shift fork.

Here you can see the new shift fork and the 180 degree plastic "bearings". They snap into the notches on the new shift fork. And the new slider with the oil galley sitting next to the old one without the oil galley.

Assembled and ready to close up.

All done.