Are all Vette pre-wired for a multi-disc rear mounted CD changer ?

 

NO, but I don't know which are and which are not.

TTT

 

Is there a harness that I need to buy ??

 

This might have some of the needed info. From the sService Manual.
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C5 12-Disc CD Changer Installation Kit Information #PI00719 - (Dec 18, 2002)
C5 12 Disc CD Changer Installation Kit Information
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When servicing the vehicle with the VIN you entered, the following diagnosis might be helpful if the vehicle exhibits the described symptoms.

Condition/Concern:
A customer may want to have a factory 12 disc CD changer installed in a vehicle that did not come with it originally.

Recommendation/Instructions:
GMSPO has an installation kit for 1999 through 2003 vehicles. No provisions are made to use this kit for 1997-1998 model year Corvettes and dealer installation is not recommended.

PART INFORMATION:

Installation package: 12497876 (bracket and harness)

CD Changer: 12495746

Harness only: 12491182

Terminals: 12047581

Please follow this diagnosis process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed. If these steps do not resolve the condition, please contact GM TAC for further diagnostic assistance. This diagnostic approach was developed for the vehicle with the VIN you entered and should not be automatically be used for other vehicles with similar symptoms.