Unit Serial Number, not the ARN
Jacques,
I don't think the '45988' is the ARN, but the Unit Serial Number for the 106th Anti-tank Regiment, which later changed to the 106th Tank Attack Regiment (AIF). If you had rubbed beneath that number lower down the panel, you would probably have uncovered three parallel bars of colour, which made up the other part of the Unit Embarkation Sign. All covered in detail in my book 'Aust Army Units and Unit Serials of the Second World War', now out of print.
I think ARN 45988 was a Cab 12 3-ton CMP, not a Cab 13.
ARN specs typically specified numerals 3 inch to 3 1/2 inch high, with no part of the figures less than 1/2 inch wide, in white paint.
Your image of the '53166' truck also shows the remains of the Bridge Sign - an irregular patch of yellow paint approximating 8 inches in diameter. Hope you kept the image of that to replicate for your truck.
Regards
Mike
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