Thanks! I found one in Oz. I'm trying to get approximate shipping sizes figured out.As you can see, it fits snug near the left/right chassis rails and just behind the crossmember near the springs and just in front of the rear most crossmember. It sits just above the spare tyre cross piece (removed in this picture since I have the spare on the rear).
Too cold and dark to go out and measure it on my 80, sorry