I figured this whole topic is alluding some folks so I will post a cut-away view of the new OEM seal.
If you follow the FSM as they describe the "correct" placement, your sealing lip will be lucky to contact the non-polished bevel of the retainer as seen in this picture. Notice where the outer lip of the seal is positioned. That lip will leave a ring on the retainer leading you to believe your seal is in the center when in fact its not sealing at all.
If and I mean if you could insert the retainer all the way into the seal, this picture shows the best you can expect is to be just on the edge of the polished shoulder of the retainer. The reason I say IF, is because the retainer will rub the axle housing if you set it that deep into the seal. Its not possible to obtain this placement.
Following my direction, you can get the sealing lip of the seal right into the center of the polished shoulder of the retainer where it was intended to be for a correct seal.