Same problem here. most of the motors I found on the net, and referenced in the post have a 10mm long shaft, whereas my motor is almost 20mm, and has a flat key on the shaft for the worm gear, so I don't think they are direct replacements. I suspec they are a special model requested by Subaru from the manufacturer.
I ended up sourcing an actuator from the US delivered for $100, compated to $260 from the dealer!
I am curious to see if anyone bought these motors and used those?