Hi Jeff,
After calling or going to a number of places, which included yards, internet, Corvette specialty businesses, dealers, and local auto parts stores, I ended up at our area GM warehouse (I get 10% over cost thru our club). I was unable to find an exact replacement. What I ended up with is a generic Klaxon made in a 3rd world country and has a package of universal connectors and plugs. It seems the originals rust out (location?) and something inside rusts away. I'm not satisfied and will keep looking, but it does meet our state inspection requirements so I needed it to pass inspection! One would think an exact replacement would be copied for those wishing to keep their C4 stock looking. And the cost? Around $32.00 for me. I believe the list is almost $50. Good luck, and if you find any let me know! Rick