Check with California Chrome Wheel (Ph. 661-294-0170). I bought a used set of '97 wheels to have plated and run on my '96 GTS. I spoke to John yesterday at California Chrome and got a quote. The price on those wheels was $150 each (plus shipping). I found them on here back in June (thread "Re: white letters on a '96 GTS", posts #411875 & 411879?). John said they have done many Viper wheels for people from the VCA site (he knew that '96 wheels were cast and the '97 wheels were forged).
Anybody with recent experience with California Chrome or others?