Here is another example. Not the one with the Nismo being smaller though.
2010 Nissan 370Z Coupe | Specs | Nissan USA
Track Width (inches)
18" Aluminum-alloy wheels (front/rear) 61.0/62.8
19" RAYSŪ forged alloy wheels (front/rear) 60.6/61.6
19" NISMO/RAYSŪ forged alloy wheels (front/rear) 61.2/62.2
Why would the base model have a bigger width than ones on the sports package?