The spacer, #8, is used to set the gap between the inner races of the bearing, the gap for the outer race is held by the hub. The "ears" on the #8 spacer is to locate the spacer in the center of the hub, so that it doesn't fall out of alignment with the bearings, so you can easily install the axle. Those two gaps have to be the same to align the inner and outer races so they're parallel.
The ONLY way to have bearing mis-alignment is if the bearings are canted in the hub.
I would remove one bearing, install the axle and spacer and see if the far bearing lines up.
If the holes where the bearings sit are worn, and the bearing doesn't press in snugly, the hub is junk (I have a couple of Honda CB hubs if you want them)
Mike: you cannot have something intrude INTO the bearing cage, the balls have to be able to move/circulate around the races... that's how roller bearings work, the roller elements have to roll.