Lynn, I forgot to measure the thickness of the damn thing
I had a look in the parts list last night, and it shows the dipstick as being 15 1/2" long, whereas your one measured up at 16" long.
In the parts book, it shows just above the 11 gal mark, what looks to be the word "FULL", with no corresponding mark.
I was sent a picture that was procured from this forum (sorry I do not know who the original owner of the photo is), showing some dipsticks that show 12 gal markings.
Do any of you Aussies have an original dipstick you can show us?