Hi Rob, The LP2 (and 2a) have the bottom spigots coming from the corner of the bottom tank (they are the middle option, not from the bottom or the back of the bottom tank. As you can see, the riveted carriers have the spigots coming from the rear of the tank.
The LP2 uses the separate pressed, commercial fan shroud, whereas the riveted carriers have an air dam as part of the side plates, which are notched to fit around the lower engine cover frame rails. They have been cut from the radiator in the pics I posted.
The fan shroud for these carriers is a three piece carrier specific shroud ( in addition to the pieces inside the forward engine bed rails)
The LP2 has short straight top spigots while the other carriers have the curved down ones.
As far as I know the LP2s all have the tropical radiators (with the extra part row of tubes at the front) I think the riveted carriers can be either or.
The riveted carriers have a bellows type pressure cap (any one got a spare?) while the Australasian carriers have an adjustable pressure valve in the overflow tube.
I cannot recall the details of the LP2 top mount, but the Northern hemisphere ones are flat with a slight downward bend where they bolt to a fabricated top mount.
I would have guessed that you knew all of this (and more than I do on the LP2 type
)