Actually, the Unit sign should go in the 'tac sign holder', and they are the same holder for both Aust cab 12 and 13. The plate with the unit sign was reversible: it was supposed to have the word 'PASS' on the back, to be displayed when the vehicle was stopped on the side of the road and was NOT in need of assistance.
Dave placed an artillery Unit sign of his choice on the right guard, which was a common position, but the regs actually say that both signs at the front should be on the left side.
Technically, the bridge sign on B vehs should be in an irregularly shaped yellow area approximating 8 inches in diameter, but there again, were often simply circular.
There are some complexities, but that's basically how it was supposed to work (except for the good ole AIF(ME), who amalgamated the Unit & Formation signs onto a single sign in early 1942).
Regarding overseas vehicle deliveries into an Australian Port, prior to a ship's arrival with a known vehicle cargo, an assembly contract was raised with an appropriate assembler most often in the region of the port of delivery. (ie deliveries into Port of Brisbane went to an assembler in Brisbane, etc)
Mike C
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