Axel seal help for my 62 Dodge Lancer

I believe that the left rear seal is leaking and getting oil on my brake shoes. I don’t believe that there is any problem with the bearings. I’ve been looking on line and can’t find the rear seals. Looking at the exploded diagram in the manual it shows only one seal at the outside end of the housing, when I look on line for parts they show inner and outer seals. I don’t believe that this car has posi traction. Any parts numbers or sources for these seals would be much appreciated.
1962 Dodge Lancer, automatic, 225 slant 6
Thanks, Bill