As stated Roof Racks are dealer fitted approved accessories. They were common to Station Wagons but no reason a dealer wouldn't have fitted it to a Panel Van or even Sedan if requested.
There is also no reason to suggest it's more correct to be fitted to one over the other it was just another accessory.
I do have a feeling that "maybe" the later "Vacationer" Wagon models might have been factory fitted.
But I don't say this with 100% confidence as it's not something I've ever paid much attention to - (earth shattering I know!).
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