I have seen one Chev. Australian Pattern Ambulance with what appears to be a Sunshine roof and this photo is one which I modeled my 1/35 scale model on.
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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"