Trev,
they all seem to have the same bolt paterns (Patrol tank even fits into a Pathfinder).
But I would measure how high it sitts above the chassis, for a ute there is more room (no floor) and I have seen one tank from Outback or Op Lock with much higher top expansion chamber part. Also some have more of a cut out on the corner for the exhaust or the rear corners to fit the corner chassis brace.