One source for used differentials is PGAuto in Frederick, Maryland. My source is going to UPS a differential from a low-mileage wagon.

Still hoping someone this evening knows if the wagon and sedan use the same differential.........

I guess there's not that much differential swapping required, especially if you keep up with the gear oil renewal schedule. At 325K miles, perhaps mine has been ignored most of the car's life. So getting a low-mileage one will be nice.

Ken300D