Hi Grant, yes I noticed the axle centre after posting and can confirm that the Aussie body was locally produced by General Motors Holden the company who assembled the Chev CMP's and also built different body types that were purely Australian.
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Cheers
Cliff Hutchings
aka MrRoo S.I.R.
"and on the 8th day he made trucks so that man, made on the 7th day, had shelter when woman threw him out for the night"
MrRoo says "TRUCKS ROOLE"