'Wrong spacer' meaning something in the wrong order? Where would the 'wrong' one come from? There is only one spacer on the outside of the hub. How wrong could one spacer be?

Where would a 'wrong' spacer come from? You got a 'grab-bag-o-spacers' you pick and choose from?
BTW...it don't matter if the rim came from Excel, Moose, DID or anyone else. It shouldn't effect the HUB spacing in regard to how IT fits between the fork legs...assuming (there's a big gamble) it was indeed laced up right.
How do the removed parts compare to the 'new' parts? While an old oil seal may be somewhat different looking than a new one..it's not going to be drastically different.
It doesn't help to have the bike not where you are.
Your next 'fresh' look at the situation will get it all sorted out!
Guaranteed!!! ...or your money back.
Good luck.
BTW..nothing wrong with allsballs bearings that replacing them in 4-6 months won't cure!