Final Drive Seal

[lawsonj5]

I just tore apart the final drive on my 68 350 because the bearings and seals were shot. Everything else appears to be ok except the axle shaft wore the case on the very outer edge where the flange was rubbing. I cant figure if that is where the outer oil seal goes or if it us the next ridge in on the case. Does anyone know the outside diameter of the outer oil seal?

Thanks,
Jess