8 3/4 rear seals

there's a seal in the axle tube, that one is before the bearing and keeps the lube in the housing.

there is a seal on the tube flange it's metal with a coating (sometimes)

then there is a seal on the axle retainer, that one keeps the grease in the bearing area.

then there is the foam seal for the backing plate.

the seal on the axle retainer is inboard.

friendly reminder: spring on the seal goes toward what you're trying to contain.