It isn't an Elizabeth body, Pagewood BAP built HQ van bodies. Most HQ vans have side vents, as do HD-HG where the HQ turret came from. It is only the last few months of construction that saw them deleted, from memory vans from about 5/74 onwards started to appear with the vents missing. The timeframe may vary slightly between the Pagewood, Elizabeth and Acacia Ridge plants depending upon who first used up the last of the side panels with flutes pressed into them (all pressings came from the one plant afaik).
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