You can probably get them made. Radials that is. Here is my friend's '67 Coronet where he thad twin blue lines made for it. They're basically a generic tire where they cut in the whitewalls and then dyed them. I had wide whitewalls made the same way several years ago. Almost all tires have a white inner rubber layer that they can cut down to. I believe the original thin whitewalls were actually a raised white rib instead of recessed.