It looks like they are just spacers with seals on them, when you fit them to the shaft without putting the drive-side cup and retainer over, they are the same diameter as the bearings, and are thus covered by the same part of the retainer. I did a couple of comparisons and it doesn't seem like the bearings would be unsupported by the cup/retainer, in fact with both spacers in there it looks like the inner-most bearing is unsupported.