The best way for all of you guys to deal with the ROTTEN All Balls (Moose is probably just as bad...) directions is this -
Remove all the old junk.
Stack the old upper and lower bearing assembley together, place them side by side and measure the height.
Stack the new upper bearing and lower bearing races and cups and seals in the same manner.
If the old bearing setup is taller than the all balls setup, your gonna need that thick washer underneath. If it's about the same height, then your good to go and don't need the washer.
The only other thing you could screw up is were in that order do you place the washer. Again, look at your stacks of bearings, think about how they work and seal out dirt and water and assemble them in that order.
In the case of the 350X, the thick washer needs to be the 1st thing installed on the stem.
Every model is different.
The All balls kits are not a thing you just want to slap together without thinking about it or you might be buying another one.....
All our government does is distract us while they steal from us, misspend our tax $ and ruin our country