Green Axles.

Post 8 the thrust block is all the way to the right.

In post 10 it is all the way to the left.

It is the horizontal shaft with the axel gears on it and an elongated slot with the spider gear shaft passing through it .

If you put one axle in brake backing plates and all. Then when you put the other axle and all in the other side you should be able to fully seat it without tightening any bolts. If not you could grind, the axel ends for clearance. Keep the heat low.