Axle Bearings and Seals

Is there only one rear axle option?
Is it the stock rear axle?
As far as I know, it's stock - everything else on this wagon is stock. And yes, for the Valiant/Dart for '63, there's only one stock option.

Here's what my manual shows as P/Ns:
Seal (there's just the inner): 2404 052, Qty 2
Gasket: 2070 997, Qty 4
Bearing: 2421 349, Qty 2