Your picture shows the axle, the retainer (with 4 holes), and some kind of ring on next. I guess you are talking about this ring? There is no "bearing retainer seal" at this point.
I've got an axle right in front of me, and this is the way I see it. First put on the retainer plate as you have shown. Next, the bearing is pressed on the axle. The bearing is one piece and is sealed. Next, the collar is pressed on the axle (to hold the bearing in place). Next the oil seal (or axle seal) is put on the axle to keep the rear end oil from leaking out the end of the axles.
