Kevin, I know they sell the whole kits to repair the window tracks and the regulators and all... But I'm not familiar with the kit you are looking at, and or how complete it is? You may have to carefully disassemble yours and double check all the parts? And you'll want to clean up all the parts/tracks and all, and relubricate before installation (obviously)
The Firebirds all hade the wood grain center dashes. Horizontal wood grain for 67 and Burlwood for 68. While the Camaro had Vertical wood grain as an option, and the black camera grain standard.
Then the consoles... Camera grain color coordinated for 67, and of course Burlwood for the firebird in 68/69... Camaro again was just the Camera grain and then 68 into 69 changed console designs...
Look around some more at Ames/PY/Classic/YO/Paddock etc to find the right combination you need.. it's gotta be out there.
If you want to go all black for the center, you should be able to find the parts by looking for Camaro stuff, or even try Rick's Camaro's etc...
And yes, the Secret Audio for in dash applications should be designed for use in the stock dash mounting location (no cutting etc)
Good luck, hope you get her set up just the way you want!