I believe the front wheel bearing seal(gasket) should be a 30x42x7 seal. From the sound of your description they have an inner diameter which is too small, so the spacer wont fit.
I also think that the spacers have the ability to be mounted between the seal and the bearing, in a way that the part of the spacer that has the lip on it is against the bearing and then the seal is installed over the top so it doesnt fall off when the axle is removed.
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