They look like "non-Ansen" Sprints if you know what I mean... I checked a few wheel brands; Mickey Thompson, American Racing (who still sell Ansen Sprints), Weld, Rocket, US Wheel, Magnum, and none that look just like them. If you could read the caps on the front wheels that would be the giveaway IMO.
My fave is the beautiful blue '40! Andy many of the plates read SA, are you in Adelaide?
Bruce