The original '69 Camaro/Firebird aftermarket Hurst install kit reused the original GM mounting plate per the instructions. It is one of the few cars out there where Hurst did not use the common universal plate they provided with all the other install kits.
If you buy a current production Hurst aftermarket install kit for this application, it will have a 2-piece Hurst provided mounting plate setup from the ones I have seen. It is a one year only Camaro/Firebird only situation. You have to use these special pieces of the shifter will be in the wrong place and won't fit the console.