HZ Sandman will also have a different wire harness. Due to the twin headlight front. Only other way it could have got it would have been if it was BO6 optioned. This could also explain the bucket seats etc (if its not a sandy)

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also if its derated GVM and a later model HZ it will be 2000kg. Which indicates its Sandman. Earlier XX7 Sandman vans were 1950kg like the utes. But the XU4 option also shares the 1950kg.