We've got 5 spots, but ACP players don't count towards it, so we get Matagi (Samoa), Ukuma (Tonga) and Uate (Fiji) for free, as far as I'm aware.
That means our quota players are Rankin, Frawley and Seb. If Mamo signs, then that still leaves us with an extra spot (feel free to correct me on that as it's changed a lot over the years)