3D Specialties on Shapeways also has 1/16 wheels.
https://www.shapeways.com/shops/3d-model-specialties?section=1%2F16+Scale&s=0
And forward resin on ebay has some. I highly recommend his, the casts are better than most found in kits. I used a set of his 1/12 on my camaro.
https://www.ebay.com/itm/Resin-1-16-Scale-Cragar-S-S-Mag-Wheels-Standard-Street-Depth/264115507618?hash=item3d7e82d1a2:g:iHMAAOSwBRNbwLqs
https://www.ebay.com/itm/Resin-1-16-Scale-15-Steel-Wheels-Front-Rear-Set-Standard-Street-Depth/323400892001?hash=item4b4c31fe61:g:IGEAAOSwHnFVzokl
Also watch WalMart for sales on diecast, you can sometimes pick up a car with a nice set of wheels for the same price or less than what most ask for just the tires and wheels.