If you're wondering....
Here is what an original CS looked like with original whitewalls on styled steel wheels. This is a shot of the premiere CS (also a GT) on the stage in the Feb 15th, 1968 dealer event in Los Angeles (and this car has not surfaced).
Somethig to consider, if you wish to be "period correct".
The trick is finding these tires...maybe through those period tires dealers, listed in Hemmings, etc. Maybe someone can find such a place for those who might want these tires. Either E70-14, or F70-14 size.
Paul.