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Hi Ralph--
I did this so long ago that I don't remember the specifics as to cost and suppliers. It involves changing the HMI module which needs to be programmed before installation. It goes just above the driver's side kick panel and installed it myself when I was younger and more nimble. The cable socket in the console needs to be changed which I did. The radio receiver needs to be changed and it is a pain--tucked up against the firewall on the passenger side, and I let my local, and very good, corvette shop do it. Sirius will need to be contacted and it was a bit of a hassle because you are changing the radio ID from what came with the car to a new ID and receiver that probably came from a different car , but patience will eventually get it done. All of the components need to be progranmed by the supplier. On star still connects, but no longer sends updates on how the various levels and wear levels are doing. You'll have to Google suppliers.