Grant / Rob,
I don't remember where i read this but Grant you are right , the Australian contract trucks did have rims for the 16'' tires.
I have visited and ridden in this beautiful truck and it is a gem, a museum piece for sure but also a day to day driver.It is pristine.
No relation whatsoever with the seller whom i know and is a really great guy.
Grab it while you can.An opportunity like this passes once in a lifetime.
I am into 15 cwt trucks. Just bought a second one.So this one is not for me.