How to identify year of Australian GM truck

[Fatcats76]

Hi, a friend of mine in Australia has purchased a less than perfect check truck with a tipper on it. It’s engine number is TR51511 and it has a high low transmission. However, it has a split windshield and what appears to be an 1954 grill. Is there a location where you can match engine/chassis/axle numbers to see what it is? We’re assuming it’s a 6400 loadmaster but could be totally wrong
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