The inner race of the inner bearing in the hub (with grease seal installed) should butt up against the machined surface of the spindle.
Here is what I'd do.
Take the caliper off its bracket. Leave the bracket mounted to the steering knuckle.
Remove the rotor from the hub.
Mount bearings and seal into the hub.
Mount the hub onto the spindle.
Put the outer washer and nut onto the spindle. Snug the nut down, then back it off 1/2 turn.
Does everything look and turn right?
If not, find out why. This should work njo matter what.
If OK so far, mount the rotor on the hub.
Now try to to mount the empty (no pads) caliper on the bracket.
If it won't go on or the rotor won't center in the caliper make sure you have the proper bracket on the proper steering knuckle. The brackets are typically mirror inages of each other. They will bolt onto the wrong-side knuckle, but the caliper will not be properly aligned with the rotor. Ask me how I know.
