If you can deal him for $500 shipped, go for it! Those wheels would look killer on a silver car.
I also recommend using them in nice weather only, since I'm sure those wheels will be very rare someday. If you have to use your Z in the winter, keep the stock rims and put some good all-season 16" tires on for snow cruisin'.
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Seeya,
Steve R. in North Jersey
'16 Go-Mango Dodge Charger R/T. It's so good to be back in a V8-powered, RWD car!