63 Dart 7 1/4" rear axle seals

Cleaning up my rear differential and changing the fluid and have a question. I am thinking on changing the axle seals. I can't tell for sure if they have leaked or not but as I have it mostly apart already thought it might be cheap insurance. Already have the new pinion seal on the way and picking up diff cover gasket and oil tomorrow.

Question I have is this:. Is it possible to replace the axle seals without removing the bearings of the axle shafts? Is there a seal inside of the bearings or are they outside of the bearings? I have found the bearings and retainer rings online but if the originals are good and I don't have to remove them from the shafts to get to the seals I'd rather not. Obviously if I need to I'll replace them, just trying to figure out what I'm getting into before pulling the rest apart.