Likely they're magnesium, which don't really get made for drag cars any more. Halibrand is still around though, they make street rod wheels and such. The rears look like '65 vintage Halibrand big windows, the front's might also be Halibrands but are more likely American Racing front runners. Ansen, Fenton or ET would be cheaper.
Try Ebay or Gasser Madness.
Found this looking around for you, looks like an old ad though.