He emailed me these pics and said quite a few have been found in Brazil. Note the comold front wheel.
With wheels variations/errors, I go by these two rules:
1) If the car has different wheels than the normal issue all the way around, it is a variation. Even if only one is found.
2) If the car has mismatched wheels, I will only consider it a variation if it is found in large numbers. The red Chevelle SS with rear PR5s is a good example of this type of variation. I know of a large number that have been found, and I myself have come across 11, all in different stores.
It appears the front comold Nova is another one of these. So if you are a Nova nut and have to have this, I would make friends with some Brazilian collectors...