Possible answer
The 1946 1-tonner and above had an option apparently for the channel-section front bumper. However, the lack of chrome I think, with what appears to be painted grille suggests to me ex-military refurb's. GM-Holden's undertook refurbishment of ex-military trucks for further military use. I wonder if some were sold on to the NEI? They would of course be rhd.
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